Boar Glue / Impaction

Boar glue, also known as impaction, is a common condition affecting male guinea pigs in which fecal material, cecotropes, bedding, hair, and sebaceous secretions accumulate in the perineal sac, a pocket of skin located between the anus and the genitals unique to male guinea pigs. This accumulation occurs when the normal expulsion of the perineal sac contents is impaired, typically due to weakening of the muscles in this area as guinea pigs age. The resulting mass of compacted material can become quite large and malodorous, causing discomfort and potential health complications if not regularly cleaned and managed. The term "boar glue" refers to the sticky, waxy nature of the sebaceous secretions that contribute to the impacted material.

This condition is extremely common in older male guinea pigs, with the vast majority of boars over four years of age experiencing some degree of impaction. The perineal sac normally functions to collect scent-marking secretions and allows male guinea pigs to deposit territorial markers. In young, healthy boars, the contents are regularly expelled during normal activity and defecation. However, as guinea pigs age, the muscles surrounding this area weaken, the production of sebaceous secretions may increase, and the ability to naturally empty the sac diminishes. This creates a progressive accumulation that requires regular human intervention to manage effectively.

The impact of boar glue on a guinea pig's health ranges from mild inconvenience to significant discomfort depending on severity and whether proper management is implemented. Mild impaction may cause no obvious distress but can produce strong odors and hygiene concerns. Moderate to severe impaction can become painful, interfere with defecation, and potentially lead to secondary problems including infection, skin irritation, and fecal retention. Guinea pigs with severe impaction may show reluctance to move normally, changes in posture, and decreased quality of life. The condition can also affect the social dynamics of guinea pig groups, as the affected boar's altered scent and discomfort may influence interactions.

Fortunately, boar glue is highly manageable with regular cleaning and attention, though it typically requires lifelong maintenance once it develops. Caregivers who learn the proper technique for cleaning the perineal sac can effectively prevent the negative consequences of impaction while maintaining their guinea pig's comfort and hygiene. Early recognition that a boar is developing impaction allows for establishment of an appropriate cleaning routine before problems become severe. While not curable, this condition is rarely dangerous when properly managed, and affected guinea pigs can maintain excellent quality of life throughout their senior years with consistent care.

The primary cause of boar glue and impaction is the age-related weakening of the muscles that control the perineal sac. In young male guinea pigs, these muscles contract effectively during defecation and movement, naturally expelling accumulated secretions and debris. As boars age, typically beginning around three to four years, these muscles progressively lose tone and strength, similar to how other muscles throughout the body may weaken with age. This reduced muscle function means the perineal sac cannot empty itself effectively, leading to gradual accumulation of material that the guinea pig can no longer expel on its own. The degree of muscle weakness varies among individuals, explaining why some older boars develop severe impaction while others experience only mild accumulation.

While impaction itself is not genetic or hereditary, individual variation in anatomy and aging patterns may have some inherited component. Some guinea pigs naturally have larger or deeper perineal sacs, which may be more prone to accumulation. The rate at which muscle tone deteriorates with age likely has some genetic influence, though environmental factors play a larger role. There is no evidence that specific guinea pig breeds are more susceptible to impaction than others, and the condition appears to affect all breeds relatively equally as they reach advanced age. Any intact or neutered male guinea pig can develop this condition regardless of genetic background.

Environmental and dietary factors influence the severity and progression of impaction. Guinea pigs housed on substrates that easily adhere to skin and secretions, such as wood shavings or dusty bedding, may experience more rapid accumulation of debris in the perineal sac. Diets that produce softer or stickier cecotropes can contribute to more problematic impaction. Inadequate fiber intake affects stool consistency and may impact the material that accumulates. The cleanliness of the living environment affects how much environmental debris becomes incorporated into the impacted mass. Guinea pigs with limited space for exercise may have reduced natural muscle activity that would otherwise help maintain perineal sac function.

Several risk factors increase the likelihood and severity of boar glue development. Age is the dominant risk factor, with virtually all male guinea pigs over five years showing at least some degree of impaction. Obesity reduces overall mobility and may accelerate muscle weakening in the perineal area. Previous injury or infection in the perineal region can cause scarring that affects normal sac function. General debility from chronic illness may contribute to faster progression of impaction. Reduced grooming ability, whether from arthritis, obesity, or other conditions, means the guinea pig cannot assist in keeping the area clean. Lack of regular caregiver monitoring allows impaction to progress unchecked until it becomes severe.

The mechanism of impaction development involves the gradual accumulation of multiple substances within the perineal sac. Sebaceous secretions from the grease gland located near this area contribute a waxy, sticky component that serves as a binding agent. Fecal pellets and cecotropes become trapped rather than passing freely. Shed hair from the guinea pig and potentially from cage mates adds to the mass. Bedding material, dust, and environmental debris stick to the secretions and become incorporated. Over time, this material compacts and hardens, especially the portions that have been present longest. The accumulated mass stretches the perineal sac, further weakening the surrounding muscles and perpetuating the cycle of accumulation.

Early warning signs of developing boar glue may be subtle and easily overlooked, especially since guinea pigs instinctively hide discomfort. Caregivers might first notice a slightly stronger or more pungent odor than usual when near their male guinea pig, even shortly after cage cleaning. A mild visible bulge in the perineal area, located just below the anus and above the genital opening, may become apparent when viewing the guinea pig from behind. The guinea pig may spend slightly more time grooming the hindquarters or may shift position more frequently when sitting. Some boars become fussier about being picked up or handled, particularly if lifting pressure is applied near the affected area. These early signs often develop gradually over weeks to months as impaction slowly worsens.

As impaction progresses, more obvious symptoms emerge that clearly indicate a problem requiring attention. The perineal sac becomes visibly distended with accumulated material, sometimes growing surprisingly large if left unaddressed. The odor intensifies significantly, often described as a strong, musky, or foul smell that pervades the cage area and is immediately noticeable when handling the guinea pig. Visual inspection of the area may reveal dark, compacted material visible at the opening of the perineal sac. The surrounding skin may appear stretched, irritated, or reddened. Fecal pellets may appear smeared or may stick to the fur around the hindquarters as they catch on the protruding mass when exiting.

Behavioral changes accompany progressive impaction and often prompt caregiver concern. Affected guinea pigs may show reluctance to move normally, adopting a slightly hunched posture or walking with an altered gait to reduce discomfort in the perineal region. Appetite typically remains normal in mild to moderate cases but may decrease if impaction becomes severe enough to cause significant pain. Some guinea pigs become more irritable or vocal when handled, particularly when pressure is inadvertently applied to the swollen area. Social behavior may change, with affected boars sometimes becoming less active in pursuing cage mates or more withdrawn from normal group activities. Lethargy may develop in severe cases as chronic discomfort takes its toll.

Physical examination reveals characteristic findings that confirm the presence and severity of impaction. Gentle palpation of the perineal area identifies a soft to firm mass within the distended perineal sac. The material inside may feel pasty, doughy, or hardened depending on composition and how long it has been accumulating. The sac opening may be stretched open by the mass or may require gentle manipulation to expose the contents. The impacted material itself typically appears dark brown to black, with a consistency ranging from soft and paste-like to dry and hardite depending on age and composition. Surrounding fur is often stained or matted from contact with the mass and secretions.

Symptom progression follows a predictable pattern without intervention. Initial mild accumulation gradually worsens as more material is added faster than any natural expulsion can occur. The perineal sac stretches progressively, losing any residual muscle tone. The mass becomes larger and more compact over time. Skin irritation may develop from prolonged contact with the accumulated material. In severe neglected cases, the skin can become damaged, creating opportunity for secondary infection. The guinea pig's discomfort increases proportionally with the size of the impaction. Mobility may become increasingly affected as the mass grows large enough to physically impede normal movement and posture.

Emergency symptoms requiring immediate veterinary attention are relatively rare with impaction alone but can occur with complications. Signs of infection including fever, visible pus, significant swelling of surrounding tissues, or foul discharge distinct from normal impaction odor warrant urgent care. Inability to defecate, evidenced by straining without producing fecal pellets, absence of feces in the cage, and abdominal discomfort, may indicate severe impaction blocking the rectum. Bleeding from the perineal area suggests tissue damage requiring professional assessment. Fly strike, where flies have laid eggs in the soiled area and maggots are present, is a true emergency requiring immediate veterinary intervention. Sudden collapse, extreme lethargy, or refusal to eat accompanying impaction symptoms indicates possible systemic complications.

Diagnosis of boar glue and impaction is primarily based on physical examination and is typically straightforward for veterinarians familiar with guinea pig anatomy. The veterinarian will obtain history from the caregiver including the guinea pig's age, when symptoms were first noticed, whether any cleaning has been attempted, and the overall health status of the animal. Physical examination involves careful inspection of the perineal area, visualizing the distended sac and accumulated material. Gentle palpation assesses the size and consistency of the impaction. The veterinarian evaluates the condition of the surrounding skin for irritation, infection, or damage. General physical examination assesses overall health and identifies any concurrent conditions that might affect management.

While impaction itself rarely requires diagnostic testing, the veterinarian may recommend tests in certain situations. If secondary infection is suspected based on examination findings such as unusual discharge, significant inflammation, or fever, culture and sensitivity testing may be performed to guide antibiotic selection. Bloodwork may be recommended for senior guinea pigs to assess overall health status and identify any underlying conditions affecting the aging process. If the guinea pig appears unwell beyond what would be expected from impaction alone, additional diagnostics help identify concurrent health problems. Radiographs are occasionally useful if there is concern about rectal blockage or other internal abnormalities.

Differential diagnosis distinguishes impaction from other conditions affecting the perineal region. Perineal or rectal tumors may cause swelling in similar locations and require different treatment approaches. Abscesses in the perineal area present with swelling but typically have a more focal, fluctuant character and may show signs of active infection. Rectal prolapse, where intestinal tissue protrudes from the anus, appears quite different on examination but affects the same general area. Severe constipation without perineal sac involvement causes defecation difficulties but does not produce the characteristic perineal mass. Parasitic infection occasionally affects this area and may need to be ruled out. Traumatic injury or bite wounds from cage mates sometimes affect the hindquarters.

Severity assessment guides the frequency and intensity of management needed. Mild impaction involves small amounts of accumulated material that can be easily expressed with gentle pressure and minimal cleaning effort. Moderate impaction shows larger accumulation requiring more thorough cleaning but without tissue damage or complications. Severe impaction features large, hardened masses that require softening before removal, and may include secondary skin irritation or early signs of infection. The veterinarian provides guidance on appropriate cleaning frequency based on severity, demonstrates proper technique for caregivers, and establishes a monitoring plan. Follow-up may be recommended to ensure caregivers have mastered the cleaning technique and to monitor the condition over time.

Emergency treatment is rarely needed for impaction alone but becomes necessary when complications develop. If secondary infection is present, the guinea pig may require guinea pig-safe antibiotic therapy to address bacterial involvement. Safe options include trimethoprim-sulfa, enrofloxacin, and chloramphenicol, while penicillin-type antibiotics must be strictly avoided as they are fatal to guinea pigs. Severe skin damage or fly strike requires immediate veterinary intervention including thorough cleaning, debridement of damaged tissue, removal of any maggots, and aggressive supportive care. Pain management with appropriate medications such as meloxicam addresses acute discomfort. Fluid therapy may be needed for guinea pigs showing signs of systemic illness.

Routine medical management of impaction centers on regular cleaning of the perineal sac to remove accumulated material. The veterinarian will demonstrate the proper technique, which involves gently expressing the contents of the sac by applying light pressure around the edges while supporting the guinea pig securely. For hardened impactions, softening the material first makes removal easier and more comfortable. This can be accomplished by applying a small amount of mineral oil, coconut oil, or similar lubricant and allowing it to soften the mass for several minutes before gentle removal. Warm water soaks of the hindquarters can also help soften stubborn impactions. Cotton swabs, gauze pads, or soft cloths assist in removing the loosened material.

Surgical intervention for impaction is extremely rare and generally not necessary when proper ongoing management is implemented. In theoretical cases of extreme neglect where massive impaction has caused permanent damage to the perineal sac structure, surgical reconstruction might be considered, but such scenarios are uncommon in guinea pigs receiving any level of care. Castration does not prevent or cure impaction, as the condition relates to the perineal sac anatomy present in all male guinea pigs regardless of reproductive status. Surgery is more likely to be needed for related complications such as tumor removal or treatment of severe infection that has not responded to medical management.

Supportive care complements regular cleaning to maintain guinea pig health and comfort. Vitamin C supplementation supports skin health and immune function. Dietary optimization with unlimited hay promotes healthy digestive function and appropriate stool consistency. Ensuring the guinea pig maintains healthy weight through proper nutrition and exercise helps preserve muscle tone as much as possible. Pain management may be needed during initial cleanings if impaction is severe and the guinea pig shows significant discomfort. Probiotic supplementation may benefit overall digestive health. Environmental modifications to reduce debris accumulation, such as switching to cleaner bedding types, support ongoing management.

Complementary approaches can assist with routine impaction management. Mineral oil or coconut oil applied to the perineal area between cleanings may help prevent material from adhering as firmly. Warm water soaks provide cleaning benefits while also offering a soothing experience for some guinea pigs. Baby wipes designed for sensitive skin can assist with routine cleaning between more thorough sessions. Some caregivers find that brief floor time on smooth, clean surfaces before cleaning helps stimulate natural expression of some material. Regular gentle massage around the perineal area may help maintain what muscle tone remains.

Treatment decisions regarding frequency and intensity of management depend on individual factors. Most guinea pigs with established impaction require cleaning every few days to weekly, with some needing daily attention and others managing well with less frequent intervention. Caregivers should work with their veterinarian to establish an appropriate schedule based on the individual guinea pig's needs. Factors influencing this include rate of accumulation, severity of symptoms between cleanings, caregiver ability, and guinea pig tolerance of the cleaning process. The goal is to prevent symptomatic buildup while minimizing stress from overly frequent handling. Keeping records of cleaning dates and observations helps establish optimal routines.

Unlike many health conditions, impaction does not have a traditional recovery timeline because it represents an ongoing age-related change rather than an acute illness. Once a guinea pig develops impaction requiring management, this need typically continues for the remainder of the animal's life. However, establishing an effective cleaning routine usually results in rapid improvement in immediate symptoms. Within one or two thorough cleanings, the mass of accumulated material can be removed, odor resolves, and any associated discomfort significantly improves. If secondary complications like skin irritation or infection were present, these typically resolve over one to two weeks with appropriate treatment while continuing routine impaction care.

Post-cleaning care focuses on maintaining the improvement achieved through initial treatment. After cleaning sessions, the perineal area should be thoroughly dried to prevent skin irritation from residual moisture. Any lubricant used to soften impaction should be removed or allowed to absorb rather than leaving excessive residue that might trap debris. Monitoring for signs of skin irritation between cleanings allows early intervention if problems develop. Keeping the cage environment clean reduces the debris available to contribute to impaction. Continuing vitamin C supplementation and optimal nutrition supports overall skin and tissue health. Regular observation of the guinea pig's behavior helps gauge comfort level and effectiveness of the cleaning schedule.

Prognosis for guinea pigs with impaction is generally excellent with proper ongoing management. This condition rarely shortens lifespan or significantly impacts quality of life when appropriate care is provided. Guinea pigs tolerate regular cleaning well, especially as they become accustomed to the routine, and most show obvious comfort improvement after each cleaning session. The primary factors affecting long-term outcome are caregiver commitment to regular maintenance and monitoring for complications. Guinea pigs whose caregivers maintain consistent cleaning schedules experience minimal negative effects from impaction and continue to enjoy normal activities, social interaction, and comfort throughout their senior years.

Long-term outlook involves acceptance that impaction management becomes a permanent part of care for affected guinea pigs. Caregivers should expect to continue cleaning routines indefinitely, typically with increasing frequency as the guinea pig ages further and muscle tone continues to decline. Building impaction care into regular husbandry routines makes this ongoing task more manageable. Many caregivers find that the cleaning process becomes quicker and easier with practice, and guinea pigs often become quite cooperative once they learn that the handling leads to relief from discomfort. Planning for continued care when traveling or during caregiver absence ensures the guinea pig's needs are consistently met. With good management, impaction need not significantly diminish quality of life for senior male guinea pigs.

Primary prevention of impaction is limited because the underlying cause is natural age-related muscle weakening that cannot be fully prevented. However, certain practices may help slow progression and reduce severity. Maintaining a healthy weight throughout life supports overall muscle tone and may delay the onset of impaction. Regular exercise through adequate cage space and supervised floor time promotes general muscular health. High-fiber diet based on unlimited grass hay supports healthy digestive function and appropriate stool consistency. Early establishment of regular guinea pig handling makes eventual impaction care easier as the guinea pig is already accustomed to being touched in various areas. Building a relationship with an exotic veterinarian before problems arise ensures access to guidance when needed.

Environmental prevention focuses on reducing factors that may worsen impaction once it begins to develop. Bedding selection affects how much environmental debris contributes to accumulation in the perineal sac. Fleece liners, paper-based bedding, or large-flake shavings may reduce the amount of fine particles that stick to secretions. Frequent cage cleaning minimizes the debris load in the environment. Adequate cage ventilation helps keep the sleeping area dry, reducing moisture that could soften feces and increase adherence. For guinea pigs showing early signs of impaction, proactive environmental optimization may reduce the rate of progression. Avoiding housing on surfaces that produce significant dust or fine particles may be beneficial.

Dietary considerations support optimal digestive health and stool quality. Unlimited timothy or other grass hay should form the foundation of the diet, promoting healthy gut motility and appropriate fecal consistency. Fresh vegetables high in fiber and vitamin C contribute to overall health. Pellets should be fed in appropriate amounts to prevent obesity while providing complete nutrition. Adequate hydration through access to fresh water supports normal digestive function. Avoiding dietary changes that produce overly soft or sticky stools may help reduce the messiness of any impaction that develops. Some caregivers find that specific vegetables or foods correlate with worse impaction in their individual guinea pigs.

Health maintenance practices support early detection and optimal management. Regular examination of the perineal area as part of routine guinea pig care allows early detection of developing impaction before it becomes severe. Monitoring for subtle behavioral changes that might indicate discomfort helps identify problems early. Regular veterinary checkups provide professional assessment and early intervention when needed. Keeping guinea pigs at healthy weight reduces physical stress on the perineal area and maintains the guinea pig's ability to groom normally. Addressing any other health conditions promptly prevents them from compounding impaction-related challenges.

Early intervention strategies maximize comfort and minimize complications when impaction begins. At the first signs of accumulation, beginning a preventive cleaning routine may slow progression. Learning proper cleaning technique from a veterinarian before it becomes urgently needed allows practice while stakes are lower. Gentle, brief cleaning sessions initially help the guinea pig become accustomed to handling. Establishing a regular schedule prevents accumulation from reaching uncomfortable levels. Documenting observations helps track changes over time and adjust management as needed. Seeking veterinary guidance early rather than waiting for severe symptoms ensures optimal management from the beginning.

Daily management for guinea pigs with impaction centers on monitoring and regular cleaning routines. Caregivers should perform quick visual checks of the perineal area during daily interactions, looking for signs of significant accumulation between scheduled cleanings. Cleaning frequency varies by individual but commonly ranges from every other day to weekly for established impaction. Setting a regular schedule helps ensure cleanings are not missed, and many caregivers find it helpful to link cleaning to another routine activity like weekly cage cleaning or specific days of the week. The cleaning process typically takes only a few minutes once caregiver and guinea pig are both accustomed to the routine. Keeping necessary supplies accessible and organized makes the process efficient.

Home environment optimization supports ongoing impaction management. Cage setup should prioritize cleanliness with easy-to-change bedding that minimizes debris. Water-resistant flooring under bedding protects against urine leakage that could create damp conditions. Providing adequate space allows the guinea pig to move freely despite any hindquarter discomfort. Ensuring the cage is easy to clean thoroughly encourages frequent maintenance. Temperature should be maintained within comfortable ranges, as guinea pigs may be less active and produce more secretions in hot conditions. If using fleece liners, having multiple sets allows frequent changes while others are being laundered.

Quality of life maintenance ensures that guinea pigs requiring impaction management still enjoy fulfilling lives. Social housing remains important, and impaction should not prevent guinea pigs from living with compatible companions. Pain management through appropriate veterinary care addresses any discomfort that interferes with normal activities. Floor time and exercise opportunities should continue as tolerated. Environmental enrichment provides mental stimulation and maintains interest in surroundings. Maintaining normal feeding routines and favorite treats contributes to happiness. Regular gentle handling, beyond just cleaning sessions, reinforces the positive human-guinea pig bond and prevents the guinea pig from associating all handling with the less enjoyable cleaning process.

Ongoing monitoring tracks the condition over time and catches any changes or complications early. Keeping a log of cleaning dates, amount of material removed, and any observations helps identify patterns and changes over time. Tracking weight weekly helps ensure overall health is maintained. Noting any changes in behavior, appetite, or activity level provides early warning of problems. Skin condition in the perineal area should be monitored for irritation, redness, or breakdown. Any changes in the character of impacted material, such as unusual odor or appearance, warrant veterinary consultation. Scheduling periodic veterinary rechecks allows professional assessment of the condition and technique review.

Caregiver support resources help ensure consistent, high-quality impaction management. Online communities and guinea pig groups often include experienced caregivers who can offer practical tips and emotional support for dealing with this common senior guinea pig issue. Veterinary practices familiar with guinea pigs can provide refresher demonstrations of cleaning technique if needed. Having backup caregivers trained in impaction management ensures care continues during travel or illness. Some pet sitting services specialize in exotic animals and can assist with routine care. Financial planning for potential complications ensures care decisions are not limited by unexpected costs. Educational resources about senior guinea pig care provide broader context for impaction management as one aspect of caring for aging pets.

Boar glue and impaction affect male guinea pigs of all breeds relatively equally, as the underlying cause is age-related muscle weakening in an anatomical structure common to all male guinea pigs. No specific guinea pig breed has been identified as having significantly higher or lower risk for developing impaction. The American, Abyssinian, Peruvian, Silkie, Teddy, Texel, and all other recognized breeds appear to develop this condition at similar rates when reaching advanced age. The primary determining factor is sex and age rather than breed, with virtually all male guinea pigs who live long enough eventually experiencing some degree of impaction requiring management.

While breed does not significantly affect impaction risk, individual factors beyond breed may influence susceptibility and severity. Guinea pigs with naturally larger or deeper perineal sacs may experience more significant accumulation. Those who age more rapidly or develop muscle weakness earlier may show impaction at younger ages. Obesity, which can occur in any breed, increases risk and complicates management. Individual variation in sebaceous gland activity affects how much waxy material contributes to impaction. Long-haired breeds may experience more hair incorporation into impacted material, potentially affecting consistency, but this does not appear to significantly change overall impaction frequency or severity compared to short-haired breeds.

For breeders, impaction considerations are limited since this is an age-related condition affecting guinea pigs well beyond typical breeding age. Breeding animals are rarely affected because they are usually retired before reaching the ages at which impaction commonly develops. There are no known genetic markers or screening tests that predict impaction susceptibility, and the condition is not considered hereditary in a meaningful sense. Breeders should focus on producing overall healthy animals with good longevity, understanding that impaction is a normal part of aging in male guinea pigs rather than a hereditary defect. Education of new guinea pig owners about this eventual likelihood helps prepare them for appropriate senior care.

Several conditions commonly co-occur with or share features with boar glue and impaction. Grease gland buildup involves similar accumulation of sebaceous secretions but affects the grease gland located on the lower back near the base of the spine rather than the perineal sac. Both conditions frequently occur together in aging male guinea pigs and require regular cleaning management. Urinary problems including sludge, stones, and infections may occur concurrently with impaction, particularly in senior guinea pigs, and symptoms may overlap when they cause straining or discomfort during elimination. Arthritis and mobility limitations common in aging guinea pigs both contribute to impaction development (by reducing grooming ability) and may be worsened by impaction-related discomfort.

Conditions with similar presenting symptoms require differentiation to ensure appropriate treatment. Rectal prolapse causes visible tissue protrusion from the anus that may initially be confused with severe impaction, but examination reveals actual intestinal tissue rather than the perineal sac contents. Tumors in the perineal region create masses that may resemble impaction but have different characteristics on palpation. Severe constipation causes straining and abdominal discomfort but does not produce the characteristic perineal mass of impaction. Perianal abscesses present with swelling in similar locations but are typically focal, fluctuant, and may show signs of active infection. Parasitic infection occasionally affects the perineal area and may cause similar hygiene challenges.

Potential complications of impaction itself include several related problems. Secondary skin infection can develop when prolonged contact with accumulated material irritates and damages the surrounding skin, creating opportunity for bacterial invasion. Fly strike represents a serious risk during warm weather if the soiled area attracts flies that lay eggs, with resulting maggot infestation constituting a medical emergency. Fecal impaction of the rectum may occur if the perineal sac mass becomes large enough to physically obstruct normal defecation. Chronic discomfort from neglected impaction can contribute to reduced appetite and activity, potentially leading to secondary GI stasis which is life-threatening in guinea pigs. Social stress may develop if cage mates react negatively to the altered scent of an affected guinea pig.