Breed family · UK guide · Original sources
Bull Terrier or Miniature Bull Terrier: what is the difference?
The Royal Kennel Club and the FCI each publish separate standards for the Bull Terrier and the Miniature Bull Terrier, and the FCI says the two are the same except for a height limit. The Bull Terrier standard sets no height or weight limit; the Miniature's height should not exceed 35.5 cm. Their colour, coat, head and temperament wording is the same. These are show-ring descriptions and registry categories, not predictions about an individual dog.
Consulted : Royal Kennel Club Bull Terrier standard, Miniature standard, the Bull Terrier and Miniature breed listings, and FCI standards N° 11 and N° 359.
The two breeds: the published guidance
Figures are the registries' ideals or listed categories. The Royal Kennel Club's note for puppy buyers says its size figures describe the ideal, so an individual dog may be larger or smaller.
| Measure | Bull Terrier | Miniature Bull Terrier |
|---|---|---|
| Height (RKC and FCI) | No height limit | Should not exceed 35.5 cm |
| Weight | No weight limit | No weight limit |
| Coat (RKC) | Short, flat, even and harsh with a fine gloss; a soft undercoat may be present in winter | |
| Colours (RKC) | White, or coloured (brindle preferred; black brindle, red, fawn and tricolour acceptable); blue and liver highly undesirable | |
| RKC listing: size, exercise | Medium · Up to 1 hour per day | Small · Up to 1 hour per day |
| RKC listing: grooming, coat length | Once a week · Short | Once a week · Short |
| RKC listing: lifespan, vulnerable native breed | Over 10 years · No | Over 10 years · Yes |
"Vulnerable native breed" is a Royal Kennel Club listing category, not a statement about any dog's health.
Where did the Miniature come from?
The Royal Kennel Club's Bull Terrier listing says the breed descends from a cross between the Bulldog and the White English Terrier and was bred for dog fighting in the 19th century. Its Miniature listing says small Bull Terriers were known in the 19th century, that the Miniature was first recognised as a separate variety in 1943, and that it was developed by breeding smaller Bull Terriers together. The FCI standards add that the smaller type had fallen out of favour and was removed from the Kennel Club register in 1918, before a revival in 1938.
Named health tests
The Kennel Club's listings name different checks before breeding. For the Bull Terrier it lists hearing testing under its BAER scheme, including litter screening; its listing also notes that deafness in all-white dogs had become a problem historically. For the Miniature it lists a DNA test for primary lens luxation (PLL) and eye testing under the BVA/KC/ISDS Eye Scheme. Both listings mention a breed club health scheme. A named test is not a result: ask a breeder for the parents' actual results, which the Kennel Club publishes through its Health Test Results Finder.
What the standards say about temperament
Both standards use the same words: courageous, full of spirit, of even temperament and amenable to discipline, and, although obstinate, particularly good with people. These describe a show-ring ideal. They do not predict how a particular dog will behave with your household, visitors or other animals, so meet the actual dog and ask about its history.
Read the separate profiles
- Bull Terrier: sourced care, history and questions
- Miniature Bull Terrier: sourced care, history and questions
Compare activity, coat upkeep and household support in the profiles, then ask a rescue or responsible breeder what is known about the specific dog. Explore Your Doggy Match or compare the two profiles; neither is a validated prediction of how an individual dog will fit your life.
The Staffordshire Bull Terrier is a separate breed; read its profile.
Sources and limits: Royal Kennel Club breed standards for the Bull Terrier (last updated 1 August 2025) and Bull Terrier (Miniature) (last updated 1 April 2025); Royal Kennel Club breed listings; FCI standards 11 and 359, official valid standards published 8 September 2026. Pages checked 31 October 2026. These are show-ring ideals and general care categories, not medical or behaviour evidence, local availability or an individual dog's needs.