Originally recognized and standard because the Jack Russell Terrier, the breed was break up in the summertime of 2001 into two separate breeds that are actually now not allowed to be bred to one another: the long-legged authentic sort now known as the Parson Russell Terrier, and the smaller, virtually at all times short-legged sort, which now alone bears the official designation Jack Russell Terrier. Breeders not solely welcome this division, however it additionally narrows the breeding base.