The Bull Terrier's most recognizable feature is its head, described as 'egg-shaped', when viewed from the front; the top of the skull and face is almost flat.

[7] A 2024 UK study found a life expectancy of 12 years for the breed compared to an average of 12.7 for purebreeds and 12 for crossbreeds.

[10] Insect bites, such as those from fleas, and sometimes mosquitoes and mites, can produce a generalised allergic response of hives, rash, and itching.

The condition is usually fatal and is characterised by poor growth, decreased serum copper and zinc levels, immunodeficiency, bronchopneumonia, skin lesions, and erosions on the distal extremities.

[12][13] A UK study found the Bull Terrier to have a predisposition to neutrophilic cholangitis, with the breed being 25.34 times more likely to acquire the condition.

[14] At the start of the 19th century, the "bull and terrier" breeds were developed to satisfy the needs for vermin control and animal-based blood sports.

This new breed combined the speed and dexterity of lightly built terriers with the dour tenacity of the Bulldog, which was a poor performer in most combat situations, having been bred almost exclusively for fighting bulls and bears tied to a post.

[16] The dog was immediately popular and breeding continued, using Dalmatian, Spanish Pointer, and Whippet to increase elegance and agility; and Borzoi and Rough Collie to reduce the stop.

[15][17] Due to medical problems associated with all-white breeding, Ted Lyon among others began introducing colour, using Staffordshire Bull Terriers in the early 20th century.