Health

As a consequence of selective breeding, French Bulldog are disproportionately affected by health related problems:

Brachycephalic airway obstructive syndrome
The skull malformation brachycephaly was increased by breeding selection which led to the occurrence of the brachycephalic airway obstructive syndrome. Therefore many French Bulldog often pant sticking out their tongue even at slight efforts like walking. The brachycephalic syndrome causes them to have multiple side effects, as in difficulty breathing (which includes snoring, loud breathing). It happens because they have narrow nostril openings, a long soft palate, and fairly narrow tracheas. This issue can lead to death in French Bulldog if they are not undergoing proper treatment.

In order to treat these dogs and create a smoother airway to the lungs, a procedure must be done that takes out a portion of their soft palate. The results of the procedure show a minimum of 60% better airway passage to the lungs.

In 2013, a UK Medical Study reviewed the health of 2228 French Bulldog under veterinary care in the UK. The study found that 1612 (72.4%) of these French Bulldog had at least one recorded health issue: "The most common disorders recorded were ear infections (14.0%), diarrhea (7.5%) and conjunctivitis (3.2%). Skin problems were the most commonly reported group of disorders (17.9%). This study of over two thousand French Bulldog provides a framework to identify the most important health priorities in French Bulldog in the UK and can assist with reforms to improve health and welfare within the breed."

Temperature regulation-related issues
The French Bulldog has only a single short coat, which combined with their compromised breathing system, makes it impossible for them to regulate their temperature efficiently. This means the dog may easily become cold, and are prone to heat stroke in hot and humid weather. French Bulldog are also prone to allergies, which can cause eczema on the body.

As they are a brachycephalic breed, French Bulldog are banned by several commercial airlines due to the numbers that have died while in the air. This is because dogs with snub noses find it difficult to breathe when they are hot and stressed. The temperature in a cargo space in an aircraft can rise as high as 30 °C (86 °F) when waiting on the runway.

Birth and reproduction
French Bulldog sometimes require artificial insemination and, frequently, Caesarean section to give birth, with over 80% of litters delivered this way.

Back and spine
French Bulldog are prone to having congenital hemivertebrae (also called "butterfly vertebrae"), which will show on an X-ray.

In October 2010, the UK French Bulldog Health Scheme was launched. The scheme consists of three levels: the first level, Bronze, designates a basic veterinary check which covers all the Kennel Club Breed Watch points of concern for the breed. The next level, Silver, requires a DNA test for hereditary cataracts, a simple cardiology test, and patella grading. The final level, Gold, requires a hip score and a spine evaluation. The European and UK French Bulldog fanciers and Kennel Clubs are moving away from the screw, cork-screw or 'tight' tail (which is an inbreed spinal defect), and returning to the short drop tail which the breed originally had. The UK breed standard now states that the tail should be "undocked, short, set low, thick at root, tapering quickly towards tip, preferably straight, and long enough to cover anus. Never curling over back nor carried gaily."

The French Bulldog may develop skin fold dermatitis.

Health

Because of its popularity after being introduced to North America in the 1970s, the breed suffered much inexperienced or rushed breeding. This resulted in not only a dramatically different look for the Shar Pei (as its most distinctive features, including its wrinkles and rounded snout, were exaggerated), but also many health problems. The American breed club states that few Shar-Peis reach the age of 10 and it has a longevity program recording those dogs that live to 10 years or more.

Compared to other breeds, Shar Peis have an increased risk of developing atopic dermatitis, a chronic allergic skin disease. Dogs with allergic skin disease often get allergy-induced skin infections. Shar Peis are also at an increased risk of demodicosis, a disease which happens when Demodex canis mites proliferate and cause skin irritation, inflammation and infection.

Familial Shar-Pei fever (FSF) is a serious congenital disease that causes short fevers lasting from 24 hours to sometimes up to three days and usually accompanied by accumulation of fluid around the ankles (called Swollen Hock Syndrome). Amyloidosis, a long-term condition, is most likely related to FSF, caused by unprocessed amyloid proteins depositing in the organs, most often in the kidneys or liver, leading eventually to kidney failure. The disease is associated with the Western type and it is estimated that 23% are affected. The Australian breed standard was changed in 2009 to discourage breeding for heavy wrinkling.

A common problem is a painful eye condition, entropion, in which the eyelashes curl inward, irritating the eye. If untreated, it can cause blindness. This condition can be fixed by surgery, "tacking" the eyelids up so they will not roll onto the eyeball for puppies or surgically removing extra skin in adolescent and older Shar-Peis. In Australia, more than eight in 10 Shar Peis require surgery to correct eye problems, contributing to them being the most expensive breed to insure.

The Shar Pei is also prone to chronic yeast infections in its ears. This is due to a tight inner ear structure with a wrinkled appearance, making cleaning very difficult; exacerbated by the tight "flap" that the ear creates over the canal, promoting a moist environment.

Vitamin B12 deficiency is a common problem in the Shar-Pei and is suspected to be hereditary.