The XL Bully is simply the largest size class of the American Bully breed — but since 2024, it’s also the one size class carrying specific legal restrictions in parts of the UK, which makes “XL Bully” a term worth understanding precisely rather than casually.
What Makes a Bully “XL”?
XL is the largest of the American Bully Kennel Club’s four recognized size classes (Pocket, Standard, Classic, and XL), generally defined as exceeding roughly 20-23 inches at the shoulder for males and 19-22 inches for females. It’s not a separate breed — an XL Bully has the same lineage and general standard as a Pocket or Standard Bully, just bred and selected toward the top of the size range.
How Big Does an XL Bully Get, and How Fast?
Adult XL Bullies commonly weigh 80-150 lbs, with a broad, heavily muscled frame. Growth is notably slow compared to many large breeds — XL Bullies often don’t reach full adult size until 18-24 months old, gaining significant weight during peak puppy growth phases. That extended growth window is also why controlling growth rate and avoiding over-exercise on hard surfaces during puppyhood matters for long-term joint health, similar to other large and giant breeds.
Is the XL Bully Banned Anywhere?
Yes, notably in parts of the UK. Since February 1, 2024, owning an XL Bully in England and Wales without a Certificate of Exemption has been illegal under an addition to the Dangerous Dogs Act 1991, following a series of high-profile attacks; Scotland introduced equivalent restrictions later that same month. Exempted dogs must be neutered, microchipped, and muzzled and leashed in public, with additional rules — including a requirement not to leave a child under 12 unsupervised with an exempted dog — phasing in through November 2026. In the US, there’s no federal ban, and the breed is broadly legal nationwide, though individual cities and counties with breed-specific legislation can restrict “pit bull-type” dogs in ways that catch XL Bullies regardless of the exact breed name.
What Should US Owners Know About Insurance and Housing Rules?
- Homeowner’s and renter’s insurance — some insurers apply breed-specific exclusions or higher premiums to “bully” and “pit bull-type” dogs, and XL Bullies are often included in that broad language even without being named specifically
- HOAs and apartment leases — many private housing agreements restrict breeds by appearance or by broad category rather than precise breed name, so an XL Bully can be affected even where local law doesn’t restrict it
- Municipal breed-specific legislation — check city and county ordinances specifically, since BSL exists at the local level in some US jurisdictions even where state law doesn’t address it
- Documentation matters — keeping vaccination, training, and any temperament-assessment records organized can help when navigating insurance underwriting or a landlord’s screening process
