Jack Russell Terrier is small and in his origin country was used to hunting foxes.
The Jack Russell terrier is principally white-bodied smooth, rough or broken-coated which is commonly confused with the Parson Russell terrier and the Russell terrier (a shorter legged, stockier variety) with the term “Jack Russell” commonly misapplied to other small white terriers.
The size of the body of this pretty small dog is in 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.
At the forst place the Jack Russell Terrier are
working terrier. Originally bred to bolt fox from their dens during hunts, they are used on numerous ground-dwelling quarry such as groundhog, badger, and red and grey fox. The working JRT is required to locate quarry in the earth, and then either bolt it or hold it in place until they are dug to. To accomplish this, the dog won’t bark but will expect attention to the quarry continuously.