The Glen of Imaal Terrier, named for the region in the Wicklow Mountains of Ireland where it was developed long ago, is a medium sized working terrier. Longer than tall and sporting a double coat of medium length, the Glen possesses great strength and should always convey the impression of maximum substance for size of dog. Unrefined to this day, the breed still possesses "antique" features once common to many early terrier types; its distinctive head with rose or half-prick ears, its bowed forequarters with turned out feet, its unique outline and topline are hallmarks of the breed and essential to the breed type.
The head must be powerful and strong with no suggestion of coarseness. Impressive in size yet in balance with, and in proportion to, the overall size and symmetry of the dog. Eyes - Brown, medium size, round and set well apart. Light eyes should be penalized. Ears - Small, rose or half pricked when alert, thrown back when in repose. Set wide apart and well back on the top outer edge of the skull. Full drop or prick ears undesirable. Nose - Black. Teeth - Set in a strong jaw, sound, regular, and of good size. Full dentition. Scissors bite preferred; level mouth accepted.
Neck - Very muscular and of moderate length. Topline - Straight, slightly rising to a very strong well-muscled loin with no drop-off at the croup. Body - Deep, long and fully muscled. Longer than high with the ideal ratio of body length to shoulder height approximately five (length) to three (height). Chest - Wide, strong and deep, extending below the elbows. Ribs - Well sprung with neither a flat nor a barrel appearance. Loin - Strong and well muscled. Tail - Docked to approximately half-length, in balance with the overall dog and long enough to allow a good handhold. Strong at root, well set on and carried gaily. Dogs with undocked tails not to be penalized.
Short, bowed and well boned. Forearm should curve slightly around the chest. Upper arm (humerus) nearly equal in length to the shoulder blades (scapula). Feet to turn out slightly but perceptibly from pasterns. Feet - Compact and strong with rounded pads.
Medium length, of harsh texture with a soft undercoat. The coat may be tidied to present a neat outline characteristic of a rough-and-ready working terrier. Over trimming of dogs is undesirable.
Strong and well muscled, with ample bone and in balance with forequarters. Good bend of stifle and a well-defined second thigh. Hocks turn neither in nor out, are short, well let down and perpendicular from hock to ground. Feet - As front, except they should point forward.