The terrier must present a lively, active and alert appearance. It should be remembered that the Jack Russell is a working terrier and should retain these instincts. Nervousness, cowardice or over aggression should be discouraged and it should always appear confident.
A sturdy, tough terrier, very much on ist toes all the time, measuring between 10“ and 15“ at the withers. The body length must be in proportion to the height and it should present a compact, balanced image, always being in a solid, hard condition.
Small ´v´ shaped drop ears carried forward close to the head and of moderate thickness.
Clean and muscular, of good length, gradually widening at the shoulders.
Round, hard padded, of cat-like appearance, neither turning in or out.
Should be set rather high, carried gaily and in proportion to body length.
Smooth, without being so sparse as not to provide a certain amount of protection from the elements and undergrowth. Rough or broken coated, without being woolly.
White should predominate with tan, black or brown markings. Brindle marked terriers are not allowed to be shown or registered with the BJRTC.
Movement should be free, lively, well coordinated with straight action in front and behind.
For showing purposes, terriers are classified in two groups; 10“ to 12“; over 12“ up to 15“.
Old scars and injuries, the result of work or accident, should not be allowed to prejudice a terrier’s chance in the show ring unless they interfere with its movement with its utility for work or stud.
Male animals should have two apparently normal testicles fully descended into the scrotum.
A Jack Russell should not show any strong characteristics of another breed.