where did the name jack russell come from
From Reverend John Russell in the early 19th century
Jack Russell Terrier
 Originating from dogs bred and used by the Reverend John Russell in the early 19th century, from whom the breed takes its name
wiki:19561834
Jack Russell Terrier [SEP] Introduction
The Parson Russell is limited only to a middle range with a standard size of , while the Russell terrier is smaller at . Each breed has different physical proportions according to the standards of their national breed clubs. Jack Russells are an energetic breed that rely on a high level of exercise and stimulation. They are relatively free from any serious health complaints. Originating from dogs bred and used by the Reverend John Russell in the early 19th century, from whom the breed takes its name, the Jack Russell has similar origins to the modern Fox terrier. It has gone through several changes over the years, corresponding to different use and breed standards set by kennel clubs.