The UKC and ABKC recognize different height and weight standards for male American Bullies across various classes. In the UKC, Standard males (studs) stand between 17 and 20 inches, while XL males exceed 20 inches, up to 23 inches. ABKC categorizes them into Pocket, Standard, Classic, and XL varieties. Pocket males measure under 17 inches, Standard males range from 17 to 20 inches, and XL males stand over 20 inches, up to 23 inches. Classic males share the Standard height range but have a lighter frame. The breed standard does not specify an exact weight requirement, but proportion and structure matter more than size. Both registries emphasize a muscular build, balanced proportions, and the signature American Bully look.

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