Jack Russell Terrier
Breed Profile
The Jack Russell Terrier is a small terrier which was once upon a time involved in fox hunting. Hailing from dogs bred and used by and named after Reverend John Russell in the early 19th century, the Jack Russell and the modern Fox Terrier has similar roots. It has gone through a myriad of changes over the years, as a result of the different use and breed standards set by kennel clubs.
Temperament
Jack Russells tend to be extremely smart, athletic, brave, and vocal dogs. It is not rare for these dogs to become moody or destructive if not properly stimulated and exercised, as they have a tendency to become bored out of their wits very easily and then will go to what it takes to create their own fun when left alone.
Color & Coat
Coat: All coat types should be dense double coats that are neither silky (in the case of smooth coats) nor woolly (in the case of rough coats).
Color: Predominantly white with black and/or brown and/or tan markings, they exhibit either a smooth, rough or a combination of both which is known as a broken coat.
Health
The breed has a high life expectancy. Breeders have protected the gene pool, and direct in-line breeding has been prevented. Jack Russells can live from 13 to 16 years if looked after properly. However, certain lines have been known for having specific health concerns and, therefore, could occur in any line or generation because of recessive genes. These issues can include hereditary cataracts, ectopia lentis, congenital deafness, patellar luxation, ataxia, myasthenia gravis, Legg–Calvé–Perthes syndrome, and von Willebrand disease.