Jack Russel Terrier

The Jack Russell terrier is a small terrier that has its origins in fox hunting. It is principally white-bodied smooth, rough or broken-coated which is commonly confused with the Parson Russell terrier (the American Kennel Club (AKC) and affiliate variant) and the Russell terrier (a shorter legged, stockier variety) with the term "Jack Russell" commonly misapplied to other small white terriers. The Jack Russell is a broad type, with a size range of 10–15 inches (25–38 cm), the Parson Russell is limited only to a middle range with a standard size of 12–14 inches (30–36 cm), while the Russell terrier is smaller at 8–12 inches (20–30 cm), however each breed has different physical proportions according to the standards of their breed clubs.
-Wikipedia