Various (except merle).Red, black and buckskin are the most commonLitter size. The American Pit Bull Terrier (APBT) is a purebred dog breed recognized by the United Kennel Club (UKC) and American Dog Breeders Association (ADBA), but not the American Kennel Club (AKC). It is a medium-sized, intelligent, short-haired dog, of a solid build, whose early ancestors came from the British Isles. The APBT is not the best choice for a guard dog since they are extremely friendly, even with strangers.