Pregnancy Toxemia / Ketosis

Pregnancy toxemia, also known as ketosis or gestational toxemia, is a devastating metabolic emergency that primarily affects pregnant guinea pig sows, particularly during the final two to three weeks of gestation. This condition develops when the energy demands of the rapidly growing fetuses exceed the mother's ability to maintain adequate glucose levels, forcing her body to break down fat stores at a rate that overwhelms the liver's processing capacity. The result is a cascade of metabolic dysfunction that can kill both the mother and her unborn pups within hours if left untreated, and frequently proves fatal even with aggressive veterinary intervention.

Pregnancy toxemia is unfortunately common in guinea pigs, with estimates suggesting it affects between fifteen and twenty percent of pregnant sows in some populations. The condition is particularly prevalent in first-time mothers, those carrying large litters of three or more pups, obese sows, sows that have experienced stress or decreased food intake during pregnancy, and guinea pigs in the final stages of gestation when fetal energy demands are highest. While the condition most commonly affects pregnant animals, a similar metabolic crisis can occur in obese non-pregnant guinea pigs and occasionally in nursing sows during peak lactation.

The impact of pregnancy toxemia on affected guinea pigs is severe and rapidly progressive. As ketone bodies accumulate in the blood, they cause metabolic acidosis that affects virtually every organ system. The liver becomes overwhelmed with fat metabolism and begins to fail. The cardiovascular system struggles to maintain adequate circulation. Neurological function declines as the brain is deprived of glucose and poisoned by ketone accumulation. Affected guinea pigs become progressively weaker, stop eating entirely, and can progress from apparently normal to moribund within twenty-four to forty-eight hours. Death occurs from multi-organ failure, and the fetuses typically die before or shortly after the mother.

Despite advances in veterinary medicine, pregnancy toxemia remains one of the most challenging conditions to treat successfully in guinea pigs. Treatment focuses on providing glucose, fluids, and supportive care, but even aggressive intervention frequently fails to reverse the metabolic crisis once it is fully established. The mortality rate for clinical pregnancy toxemia ranges from seventy-five to ninety percent in most reports, making prevention absolutely essential. Understanding the risk factors, recognizing the earliest possible warning signs, and ensuring pregnant guinea pigs maintain consistent food intake throughout gestation offers the best hope for preventing this devastating condition.

The primary cause of pregnancy toxemia is a severe negative energy balance that develops when the metabolic demands of pregnancy exceed the guinea pig's glucose production capacity. During the final weeks of pregnancy, fetal growth accelerates dramatically, and the developing pups require substantial amounts of glucose for their metabolism. Simultaneously, the enlarged uterus compresses the stomach and intestines, physically reducing the amount of food the sow can consume. When caloric intake cannot meet energy demands, the body begins breaking down fat stores to produce ketone bodies as an alternative energy source. In guinea pigs, this process quickly becomes pathologically excessive, overwhelming the liver and causing systemic toxicity.

While pregnancy toxemia itself is not a genetic condition, certain inherited characteristics can predispose individual guinea pigs to developing this metabolic emergency. Guinea pigs with genetic tendencies toward obesity may be at higher risk because excess body fat provides abundant substrate for ketone production when the metabolic crisis begins. Some family lines may have inherently less efficient metabolic pathways that make them more vulnerable to ketosis. Genetic factors affecting litter size indirectly influence risk, as guinea pigs from lines producing larger litters face greater fetal energy demands. However, environmental and husbandry factors are far more important than genetics in determining pregnancy toxemia risk.

Environmental factors play a crucial role in precipitating pregnancy toxemia episodes. Any stressor that causes decreased food intake during late pregnancy can trigger the condition, including changes in housing, introduction of new cage mates, loss of a companion, loud noises, temperature extremes, or poor air quality. Inadequate access to food due to competition from cage mates, improperly functioning water bottles, or insufficient hay availability creates dangerous situations. Environmental stresses that increase metabolic rate, such as cold temperatures, increase energy demands while potentially decreasing appetite. Changes in diet during pregnancy, particularly reduction in caloric density, can create negative energy balance even if the sow appears to be eating normally.

Several specific risk factors dramatically increase a guinea pig sow's vulnerability to pregnancy toxemia. Obesity is the single most significant risk factor, as overweight sows have both increased metabolic demands and abundant fat stores to fuel dangerous ketone production. Carrying a large litter of three or more pups increases fetal energy requirements beyond what many sows can support. First-time mothers appear more susceptible than experienced sows. Advanced age at first breeding compounds risk. Any period of decreased food intake during the last three weeks of pregnancy, even from something as simple as stress during travel or veterinary visits, can trigger the metabolic cascade. Hot weather causing decreased appetite, concurrent illness suppressing food intake, and dental problems preventing adequate chewing all increase risk.

The mechanism of pregnancy toxemia development involves a self-reinforcing cycle of metabolic deterioration. When glucose intake becomes insufficient to meet demands, the liver begins converting body fat to ketones at an accelerated rate. As blood ketone levels rise, they cause nausea and appetite suppression, further reducing food intake. The liver becomes infiltrated with fat, impairing its function and reducing its ability to produce glucose from other sources. Blood glucose continues to fall while ketones continue to rise. Metabolic acidosis develops as the acidic ketone bodies overwhelm the body's buffering systems. Cardiovascular function deteriorates, kidney function declines, and neurological symptoms appear. Once this cycle is fully established, it becomes extremely difficult to interrupt even with aggressive medical intervention.

Early warning signs of pregnancy toxemia are often subtle and easily missed, making daily monitoring of pregnant sows absolutely critical during the final weeks of gestation. The earliest indication may be slightly decreased enthusiasm for food, with the sow eating less eagerly or finishing meals more slowly than usual. Mild lethargy, spending more time resting and less time exploring or interacting with cage mates, can be an early sign. Some sows may show decreased interest in their surroundings or seem slightly withdrawn. A slight decrease in fecal pellet production may occur as food intake diminishes. These subtle changes, occurring in a pregnant sow during the last two to three weeks of gestation, should prompt immediate veterinary evaluation to prevent progression to full-blown toxemia.

As pregnancy toxemia progresses, common symptoms become more apparent and concerning. Complete loss of appetite develops, with the sow refusing all food including favorite treats. Weakness becomes evident, with the guinea pig moving slowly and reluctantly. The sow may sit in a hunched position with her fur fluffed up, appearing generally unwell. Decreased water intake accompanies appetite loss. Fecal pellets become smaller, fewer, and may eventually cease altogether. The sow may appear depressed and show no interest in her environment. Weight loss can be rapid despite the pregnancy, as the body consumes its own tissues for energy.

Behavioral changes in a guinea pig developing pregnancy toxemia are dramatic and disturbing. Affected sows typically become very quiet, stopping the normal vocalizations that characterize guinea pig communication. They may seek out dark corners or hide more than usual, consistent with the prey animal instinct to conceal weakness. Social interaction stops, and the sow may seem disconnected from cage mates. Normal grooming behaviors cease, and the coat may appear unkempt. The sow becomes progressively less responsive to handling and may allow manipulation without the normal resistance. Some guinea pigs develop apparent confusion or disorientation as ketones affect brain function.

Physical signs of pregnancy toxemia provide important information about disease severity. The sweet or fruity odor of ketones may be detectable on the guinea pig's breath or in her urine, though this requires close attention to notice. Muscle wasting may become apparent, with the sow losing condition visibly despite her pregnant belly. Dehydration signs including skin tenting and sunken eyes develop. The sow may feel cold to the touch, particularly in the extremities, as circulation deteriorates. Breathing may become labored or rapid as metabolic acidosis worsens. Drooling or excessive salivation sometimes occurs. In late stages, muscle tremors, twitching, or frank seizure activity may be observed.

Symptom progression in pregnancy toxemia is rapid and unrelenting once the metabolic cascade is fully underway. What begins as mild appetite decrease can progress to complete system failure within twenty-four to forty-eight hours. Lethargy deepens into stupor, with the sow becoming recumbent and unable to rise. Breathing becomes increasingly labored. Body temperature drops below normal. Coma may develop as brain function deteriorates. Seizures can occur in terminal stages. Death typically results from cardiovascular collapse or respiratory failure. The fetuses may die before the mother due to placental insufficiency, or may be expelled as the sow declines. The speed of this deterioration makes early intervention absolutely critical.

Emergency symptoms requiring immediate veterinary care in a pregnant sow include any decrease in appetite during the final weeks of pregnancy, lethargy or weakness, refusal to eat for more than a few hours, decreased or absent fecal production, apparent confusion or disorientation, muscle tremors or twitching, a sweet or fruity odor to the breath or urine, labored breathing, cold extremities, inability to stand, and any pregnant sow that appears unwell. Given the rapid progression and high mortality rate of pregnancy toxemia, the threshold for seeking veterinary care should be extremely low. It is far better to have a pregnant sow evaluated unnecessarily than to wait until the condition has progressed beyond the point where intervention can help.

Initial examination by an exotic veterinarian experienced with guinea pig reproduction focuses on rapid assessment and immediate stabilization of the pregnant sow. The veterinarian will evaluate cardiovascular status, checking for signs of shock including pale gums, prolonged capillary refill time, weak pulse, and cold extremities. Neurological assessment determines the level of consciousness and checks for any evidence of seizure activity or focal deficits. The pregnancy is evaluated through palpation and possibly imaging to assess fetal viability. Body temperature, heart rate, and respiratory rate provide important baseline information. The veterinarian will gather history about the sow's appetite, activity level, and any stressors over the preceding days while simultaneously beginning emergency treatment.

Diagnostic tests help confirm pregnancy toxemia and assess its severity. Blood glucose measurement typically reveals hypoglycemia, often severe, in affected sows. Urine testing may detect high levels of ketones, confirming the ketotic state. Blood chemistry panels assess liver and kidney function, which are often compromised in pregnancy toxemia. Blood gas analysis reveals the degree of metabolic acidosis. Complete blood count may show stress-related changes but is typically less diagnostically useful than chemistry values. Radiographs or ultrasound can evaluate fetal viability and number, helping to guide treatment decisions regarding whether to attempt emergency cesarean section.

Differential diagnosis considers other conditions that can present similarly to pregnancy toxemia in pregnant guinea pigs. Dystocia, where a guinea pig is unable to deliver her pups normally, causes distress and can involve metabolic derangements but has a different presentation and treatment. Uterine torsion or rupture are surgical emergencies with some overlapping symptoms. Severe GI stasis can cause anorexia and lethargy similar to early toxemia. Respiratory infections cause lethargy and decreased appetite. Other metabolic conditions such as renal failure could present similarly. Non-pregnancy-related ketosis can occur in obese guinea pigs that stop eating for any reason. The combination of pregnancy, hypoglycemia, and ketosis in the appropriate clinical context confirms the diagnosis of pregnancy toxemia.

Confirmation of diagnosis and severity assessment directly influences treatment decisions and helps establish prognosis, which is unfortunately guarded to poor in most cases. The combination of appropriate history, clinical signs, hypoglycemia, and ketonuria in a late-gestation pregnant sow confirms pregnancy toxemia. Severity is assessed based on the degree of hypoglycemia, level of metabolic acidosis, neurological status, cardiovascular stability, and fetal viability. Sows presenting early in the disease course with mild hypoglycemia and minimal acidosis have better chances than those presenting obtunded with severe metabolic derangements. The veterinarian will discuss findings honestly with the owner, explaining that even with aggressive treatment, mortality rates for clinical pregnancy toxemia are extremely high.

Emergency and immediate treatment for pregnancy toxemia focuses on correcting hypoglycemia, reversing ketosis, and supporting failing organ systems. Intravenous or intraosseous access should be established immediately for fluid and dextrose administration. Glucose supplementation is the first priority, with dextrose solutions administered carefully to raise blood glucose levels. Overly rapid glucose administration must be avoided to prevent cerebral edema. Aggressive fluid therapy with balanced electrolyte solutions helps correct dehydration and improve tissue perfusion. Calcium supplementation may be needed if hypocalcemia is contributing to the clinical picture. Body temperature should be supported with external warming if hypothermia is present. Oxygen supplementation may be beneficial for sows in respiratory distress.

Medical management continues once initial stabilization has been achieved. Ongoing glucose supplementation through intravenous fluids or frequent oral feeding maintains blood glucose levels. Treatment of metabolic acidosis with appropriate fluid therapy and supportive care helps restore normal acid-base balance. Anti-nausea medications may help reduce the appetite suppression caused by ketosis. Hepatoprotective agents may be administered to support the overwhelmed liver. Pain medications can be used if dystocia or other painful conditions are contributing. If antibiotics are needed for any concurrent infection, only guinea pig-safe antibiotics should be used, strictly avoiding penicillins and related compounds. B vitamins may support metabolic recovery.

Surgical intervention in the form of emergency cesarean section may be considered in certain circumstances. If the fetuses are still viable and the sow is stable enough to undergo anesthesia, cesarean section removes the metabolic demand of the pregnancy and gives both mother and pups a chance at survival. However, anesthesia in a metabolically compromised guinea pig carries significant risk, and the decision to proceed with surgery must weigh the potential benefits against the dangers. If the fetuses have already died, their removal may still be necessary but carries similar anesthetic risks without the benefit of saving the pups. In some cases, medical stabilization before attempting surgery may improve outcomes if time permits.

Supportive care is essential throughout the treatment of pregnancy toxemia and must be continued intensively. Syringe feeding with critical care formula provides both nutrition and glucose substrate, but must be done carefully in sows with altered consciousness to avoid aspiration. Small, frequent feedings are preferable to large boluses. Maintaining body temperature with warming support is critical. Close monitoring of blood glucose, hydration status, and neurological function guides ongoing treatment adjustments. If the sow delivers or undergoes cesarean section, the pups may require hand-raising if the mother is too ill to nurse. The sow may require hospitalization for several days even if she begins to improve.

Alternative and complementary treatments have limited application in acute pregnancy toxemia, which requires aggressive conventional medical intervention. However, once the acute crisis has passed, supportive care including optimal nutrition, stress reduction, and vitamin C supplementation aids recovery. Some practitioners use herbal preparations or homeopathic remedies as adjuncts to conventional care, though no alternative treatments have proven efficacy for this condition. The focus must remain on maintaining adequate caloric intake and preventing recurrence of the ketotic state. These approaches never replace essential emergency veterinary care.

Treatment decisions for pregnancy toxemia involve difficult conversations with guinea pig owners about prognosis and quality of life. Even with optimal treatment, mortality rates exceed seventy-five percent in most reports. Owners must understand that aggressive treatment may prolong the dying process rather than achieving recovery. The status of the pregnancy significantly affects decisions, with viable pups making cesarean section worth considering despite the risks. Some owners may elect humane euthanasia rather than pursuing aggressive treatment with poor odds, particularly if the sow is severely compromised at presentation. The veterinarian should provide compassionate, honest guidance to help owners make decisions aligned with their guinea pig's best interests.

Recovery timeline for the minority of guinea pigs that survive pregnancy toxemia is typically prolonged and requires intensive ongoing care. Initial stabilization may require several days of hospitalization with intravenous fluids and glucose supplementation before the sow is eating enough on her own to maintain blood glucose levels. Transition from hospital to home care is gradual, with close monitoring for any signs of relapse. Complete metabolic recovery may take two to four weeks, during which time the sow requires consistent, adequate nutrition. If pups survived, either through vaginal delivery or cesarean section, they may need supplemental feeding if the mother cannot nurse adequately.

Post-treatment care focuses on maintaining consistent nutrition and preventing recurrence of the ketotic state. Frequent small meals should be offered to prevent any extended periods without food intake. Critical care formula may need to be supplemented if the sow is not eating adequate amounts of hay and vegetables. Fresh water must be continuously available and intake monitored. The sow should be kept in a quiet, stress-free environment during recovery. If she survived with living pups, nursing increases her metabolic demands and nutrition must be adjusted accordingly. Weaning should occur at the normal time of three weeks to reduce the ongoing metabolic burden. Follow-up veterinary visits are essential to monitor recovery progress.

Prognosis factors for pregnancy toxemia survival and recovery include the severity of metabolic derangements at presentation, how quickly treatment was initiated, the sow's response to initial therapy, and whether any permanent organ damage occurred. Sows presenting early with mild disease have better odds than those presenting in metabolic crisis. Those whose blood glucose stabilizes quickly and who begin eating within the first one to two days of treatment are more likely to survive. Sows that develop permanent liver damage, kidney failure, or neurological deficits from prolonged hypoglycemia have more guarded long-term prognoses. Successful delivery or removal of pups, whether vaginal or via cesarean, improves chances by eliminating the ongoing metabolic demand of pregnancy.

Long-term outlook for pregnancy toxemia survivors varies considerably. Some sows make apparently complete recoveries and can live normal lives, though breeding is strongly discouraged in any guinea pig that has experienced pregnancy toxemia. Others may have lasting effects including chronic liver dysfunction, increased susceptibility to metabolic stress, or other complications. Weight management becomes especially important, as obesity increases the risk of future metabolic problems. Any future pregnancy carries extremely high risk of recurrence and should be prevented through spaying once the sow has recovered sufficiently to undergo elective surgery. Careful monitoring for any signs of illness is warranted lifelong, as these guinea pigs may have reduced metabolic resilience.

Primary prevention of pregnancy toxemia centers on appropriate breeding practices and maintaining optimal body condition in breeding sows. Guinea pigs should be bred for the first time before six months of age to ensure the pelvic symphysis can separate adequately for delivery, but this must be balanced against avoiding breeding guinea pigs that are too young. Only guinea pigs in optimal body condition should be bred, with obesity being an absolute contraindication. Sows should be monitored throughout pregnancy with regular weigh-ins and observation of eating habits. Breeding should be planned to avoid environmental stressors during late gestation. The number of previous litters should be considered, as repeated breeding may increase risk.

Environmental prevention strategies focus on maintaining stress-free conditions and consistent food access throughout pregnancy. Pregnant sows should be housed in quiet locations away from loud noises, high traffic areas, and potential predators. Temperature should be maintained in the comfortable range of sixty-five to seventy-five degrees Fahrenheit, avoiding extremes that increase metabolic demands or suppress appetite. Pregnant sows should not be shipped, transported unnecessarily, or subjected to major environmental changes during late gestation. If cage changes are necessary, they should be made early in pregnancy. Compatible companions can be housed with the pregnant sow to provide social support, but aggressive or dominant cage mates should be removed.

Dietary prevention is crucial for pregnancy toxemia. Pregnant sows should have unlimited access to high-quality grass hay at all times, ensuring the fiber and calories they need to maintain gut function and energy balance. Quality pellets appropriate for breeding guinea pigs should be provided in adequate amounts, with some breeders increasing pellet rations during late pregnancy. Fresh vegetables high in vitamin C should be offered daily. Water must always be available, with bottle function checked daily. Any dietary changes should be made gradually before or very early in pregnancy, never during late gestation. Foods should be offered in a way that ensures the pregnant sow can eat without competition from cage mates.

Health maintenance practices support metabolic stability throughout pregnancy. Regular veterinary monitoring of pregnant sows allows early detection of any problems. Weighing the sow weekly throughout pregnancy helps identify any concerning weight changes. Vitamin C supplementation is especially important during pregnancy, as demands increase and deficiency can compromise overall health. Dental health should be verified before breeding and monitored throughout pregnancy, as dental pain can cause decreased eating. Any signs of illness should be addressed immediately, as the stress of concurrent disease increases pregnancy toxemia risk. Having an experienced exotic veterinarian involved in pregnancy monitoring improves outcomes.

Early intervention strategies may prevent the progression of early ketosis to fatal toxemia. Any pregnant sow showing decreased appetite, even if she seems otherwise normal, should be encouraged to eat through offering favorite foods, hand feeding, or syringe feeding if necessary. Veterinary consultation should occur immediately if a pregnant sow in late gestation refuses food or shows any signs of illness. Keeping critical care formula on hand allows immediate supplemental feeding if needed. Knowing the signs of early pregnancy toxemia enables rapid response. Some veterinarians recommend prophylactic glucose supplementation for high-risk sows during late gestation. Spaying guinea pigs not intended for breeding eliminates pregnancy toxemia risk entirely.

Daily management of guinea pigs at risk for pregnancy toxemia, including pregnant sows and obese individuals, requires heightened attention to nutrition and behavior. Food intake should be monitored closely, with any decrease prompting immediate attention. Pregnant sows in late gestation should be observed multiple times daily to ensure they are eating and active. Water consumption should be tracked, and bottles checked for proper function daily. Fecal output provides insight into food intake and gut function. Weighing pregnant sows every few days during the final weeks of gestation helps identify concerning trends. Any deviation from normal behavior or eating patterns in a pregnant sow should be treated as a potential emergency.

Home environment considerations for pregnant guinea pigs prioritize stress reduction and food accessibility. The cage should be in a quiet, climate-controlled area with minimal disturbance. Multiple hay sources ensure constant access without competition. Water bottles should be positioned for easy access and checked regularly. If the pregnant sow is housed with companions, monitoring should confirm she can access food and water without interference. Comfortable, clean bedding supports rest during the demanding final weeks of pregnancy. Hiding spaces provide security for the sow and should be large enough to accommodate her growing size. Environmental temperature should be monitored to prevent overheating, which suppresses appetite.

Quality of life maintenance for pregnant guinea pigs balances the special needs of pregnancy with normal guinea pig enrichment. Pregnant sows can and should continue to have floor time, social interaction, and mental stimulation, though activities should be modified to reduce stress and physical demands in late gestation. Gentle handling maintains the bond with caregivers and allows for regular health monitoring. Companionship from compatible cage mates provides important social support. Enrichment activities that encourage eating, such as hay stuffed in toilet paper tubes or scattered for foraging, support both mental stimulation and adequate nutrition. The goal is a calm, contented pregnant sow who is eating well.

Monitoring and ongoing care routines during pregnancy focus on early detection of any problems. A daily checklist covering food consumption, water intake, fecal output, activity level, and overall demeanor ensures nothing is missed. Weekly weigh-ins with a gram scale track weight gain patterns throughout pregnancy. A pregnancy journal documenting observations can be invaluable if concerns arise that require veterinary consultation. Having emergency contact information for an exotic veterinarian, including after-hours and emergency services, ensures rapid access to care if needed. Knowing how to syringe feed and having critical care formula on hand enables immediate intervention if the sow's appetite decreases.

Caregiver support and resources help those managing pregnant guinea pigs navigate the demands and anxieties of guinea pig breeding. Connecting with experienced breeders or guinea pig communities provides access to mentorship and support. Understanding that pregnancy toxemia can occur despite excellent care helps caregivers cope if their sow is affected. Educational resources about guinea pig pregnancy, including warning signs and emergency response, improve preparedness. Financial planning for potential emergency veterinary care reduces stress if complications occur. Recognizing the significant risks involved in guinea pig breeding helps caregivers make informed decisions about whether to breed and how to minimize risks. Many experienced guinea pig enthusiasts recommend spaying rather than breeding due to the many potential complications.

All guinea pig breeds are susceptible to pregnancy toxemia when pregnant, as this condition relates to the fundamental metabolic challenges of guinea pig pregnancy rather than breed-specific characteristics. However, certain factors associated with particular breeds may modify risk. Larger guinea pig breeds may be at slightly elevated risk if their size is associated with higher food requirements that are more difficult to meet during late pregnancy. Smaller breeds carrying proportionally large litters relative to their body size face significant fetal demands. Long-haired breeds including Peruvian, Silkie, Coronet, and Texel guinea pigs have the same baseline risk as short-haired breeds. Satin guinea pigs are not specifically predisposed to pregnancy toxemia but may have other health challenges that complicate pregnancy.

Moderate risk considerations apply across all guinea pig breeds based on individual factors rather than breed identity. Any obese guinea pig is at dramatically elevated risk for pregnancy toxemia if bred, regardless of breed. First-time mothers face higher risk than experienced sows. Older sows, particularly those bred for the first time after six months of age, have increased risk. Guinea pigs with histories of difficult pregnancies, large litters, or fetal losses may be predisposed to complications. Those with underlying metabolic conditions, dental disease affecting eating, or chronic illnesses should not be bred. Genetic lines with histories of pregnancy complications warrant caution.

Screening recommendations for breeders emphasize preventing pregnancy toxemia through careful breeding decisions. Body condition should be assessed before breeding, with overweight guinea pigs placed on carefully monitored weight reduction programs before any breeding is considered. Complete physical examination by an exotic veterinarian should precede breeding to identify any health issues that might complicate pregnancy. Genetic lines with histories of pregnancy toxemia or other complications should be evaluated critically. Breeders should maintain detailed records of pregnancy outcomes to identify any concerning patterns. Education about pregnancy toxemia signs, prevention, and early intervention should be standard for anyone breeding guinea pigs. Many veterinary professionals and rescue organizations discourage guinea pig breeding entirely due to the significant risks involved.

Several conditions commonly co-occur with or predispose guinea pigs to pregnancy toxemia. Obesity is the most significant predisposing factor and is often present in affected sows. Hepatic lipidosis develops as part of the pregnancy toxemia syndrome when fat mobilization overwhelms liver function. Hypoglycemia is intrinsic to the condition and contributes to the clinical signs and mortality. Dental disease that interferes with adequate food consumption can precipitate the negative energy balance that triggers ketosis. GI stasis may develop secondary to the appetite loss and metabolic derangements of pregnancy toxemia. Concurrent infections or other illnesses that cause stress or decreased food intake can trigger toxemia in an otherwise stable pregnant sow.

Conditions presenting with similar symptoms to pregnancy toxemia require differentiation in pregnant guinea pigs. Dystocia, or difficult labor, causes distress and lethargy in pregnant sows but occurs during active labor rather than before. Uterine torsion or rupture cause acute collapse that can resemble advanced toxemia. Non-pregnancy-related ketosis can occur in obese guinea pigs that stop eating for any reason and presents similarly. Severe GI stasis causes anorexia and lethargy that overlap with early toxemia. Respiratory infections cause lethargy and decreased appetite. Urinary obstruction or bladder stones cause distress that might be confused with pregnancy complications. Careful history, physical examination, and diagnostic testing distinguish between these possibilities.

Potential complications arising from pregnancy toxemia are numerous and often fatal. Multi-organ failure develops as metabolic acidosis, poor perfusion, and direct ketone toxicity damage vital organs. Liver failure from hepatic lipidosis is common and may be permanent in survivors. Kidney damage from hypoperfusion can result in chronic renal insufficiency. Neurological damage from prolonged hypoglycemia may cause lasting deficits. Fetal death typically occurs and may be followed by dystocia if dead fetuses cannot be delivered. Uterine infection can develop if retained fetuses decompose. Cardiovascular collapse is the terminal event in most fatal cases. Survivors may face long-term metabolic sensitivity and should never be bred again.