Health

Pugs are prone to brachycephalic airway obstructive syndrome (BAOS) which causes respiratory distress in short-snouted breeds. Pugs have elongated palates. When excited, they are prone to "reverse sneezing" which causes them to quickly (and seemingly laboriously) gasp and snort. The veterinary name for this is pharyngeal gag reflex and it is caused by fluid or debris getting caught under the palate and irritating the throat or limiting breathing. Reverse sneezing episodes are usually not harmful, and massaging the dog's throat or covering its nose in order to make it breathe through its mouth can often shorten a sneezing fit.

Some pugs are also born with stenotic nares (pinched nostrils) which can inhibit their breathing. In serious cases, it makes breathing even more difficult and puts added pressure on the larynx. In some cases, the dog could pass out from blocked airways. If this happens, one should inquire with their veterinarian whether or not surgery is needed to open the nostrils.

Protruding eyes and eye prolapse is a common problem among pugs and other brachycephalic breeds and can be caused by a trauma to the head or neck. While the eye can usually be pushed back into its socket by the owner or by a vet, veterinary attention is usually advisable. If the prolapse happens on a regular basis, the pug might require surgery.

Pugs have many wrinkles in their faces, so owners will often clean inside the creases to avoid irritation and infection. If this is not done, the dog may develop a condition known as skin fold dermatitis.

An abnormal formation of the hip socket, known as hip dysplasia, affected nearly 64% of pugs in a 2010 survey performed by the Orthopedic Foundation for Animals; the breed was ranked the second worst-affected by this condition out of 157 breeds tested.

Pugs are one of several breeds that are more susceptible than other dogs to demodectic mange, also known as "demodex". This condition is caused when parasitic mites, that are often present in a dog's skin without causing symptoms, are allowed to do damage because their host has a weakened immune system. It is a problem for many young pugs, although not usually a major one, and is easily treatable, but some are especially susceptible and present with a systemic form of the condition. This vulnerability is thought to be genetic and breeders will avoid producing puppies from adults who have this condition.

In 2008, an investigative documentary carried out by the BBC found significant inbreeding between pedigree dogs, with a study by Imperial College, London, showing that the 10,000 pugs in the UK were so inbred that their gene pool was the equivalent of only 50 individuals.

Pugs can suffer from necrotizing meningoencephalitis (NME), also known as pug dog encephalitis (PDE), an inflammation of the brain and meninges. NME also occurs in other small dogs, such as the Bichon Frise, Maltese, and Chihuahua. There is no known cure for NME, which is believed to be an inherited disease. Dogs usually die or have to be put to sleep within a few months of onset, which, in those susceptible to this condition, is mostly between six months and three years of age.

This breed, along with other brachycephalic dogs (e.g., boxers, bulldogs), are also prone to hemivertebrae. The curled tail of a British bulldog is an example of a hemivertebrae, but when it occurs not in the coccygeal vertebrae but in other areas of the spine, it can cause paralysis. The condition occurs when two parts of a spinal vertebra do not fuse properly while a young pug is still growing, resulting in an irregularly shaped spinal cavity which can put pressure on the spinal cord.

Health

Bichon Frises are prone to scratching and chewing on themselves in the summer because of the warm and moist air, which commonly results in serious skin conditions. They are comparatively hypoallergenic, but they themselves suffer from allergies to fleas, ticks, chemicals, pollen, dust, etc. Loose knee joints, ear infections, cataracts, diabetes, and heart disease are also common.

Bichons are also prone to liver shunts. These often go undetected until later in life, leading to complications that cannot be addressed, and therefore liver failure. Bichons who are underweight, runts of the litter, or have negative reactions to foods high in protein are more likely to be suffering from a shunt. When detected early, shunt often can be corrected through surgery. However, the later in life the shunt is detected, the lower the likelihood of surgery being successful. Shunts can be kept under control through special low-protein diets and through medications to support liver function, help flush toxins that build up in the kidneys and liver, and control seizures that often occur as a symptom of the shunt. Without surgery, Bichons with shunts on average live to be 4–6 years old. Other symptoms include dark urine, lethargy, loss of appetite, and increased thirst. Seizures come in all forms; episodes of seizures can begin early in life but may go undetected. Early seizures can appear as a hypnotic state or an episode of vertigo.

Autoimmune hemolytic anemia (AIHA, also called immune-mediated hemolytic anemia, or IMHA) and immune-mediated thrombocytopenia (ITP) are responsible for many premature Bichon Frise deaths. These diseases can strike with little or no warning and kill very quickly. In AIHA, the dog's immune system attacks its own red blood cells, leading to severe, life-threatening anemia. Symptoms include weakness, loss of energy, lack of appetite, vomiting, diarrhea, rapid heart rate, rapid breathing, dark urine, and pale or yellow gums.

ITP often accompanies AIHA. In ITP, blood platelets (which cause blood clotting) are destroyed. The most common clinical signs are haemorrhages of the skin and mucus membranes. Mortality rates of 20% to 80% are reported.