Patterjack
The Patterjack is a cross between the Patterdale Terrier and the Jack Russell. Because each hybrid inherits a unique combination of traits from both parents, we recommend thoroughly researching both breeds before choosing a Patterjack. Pay special attention to temperament, health issues, and care requirements, as your dog may express characteristics from either parent breed.
Patterdale Terrier
The Patterdale Terrier is a compact, sturdy working terrier standing between 10 and 15 inches at the withers and typically weighing 11 to 13 pounds, presenting a small but remarkably powerful package designed for demanding field work. This breed displays a muscular, well-proportioned frame built specifically for the challenging work of pursuing quarry underground through narrow passages and rocky terrain. The body structure emphasizes pure functionality over aesthetics, with a chest that is notably small and flexible enough to be spanned by average-sized hands, an essential characteristic allowing the dog to navigate through tight underground passages when working foxes and other quarry deep within their dens. The breed displays three distinct coat types that all provide excellent weather protection for extended outdoor work in harsh conditions. The smooth coat variety features dense, stiff, coarse hair lying close to the body and providing streamlined protection. The broken coat type presents an intermediate texture with some longer hairs scattered throughout and may include facial furnishings such as a beard or eyebrows. The rough coat variety shows the longest hair with a coarse, harsh texture throughout the body and always includes prominent facial furnishings including a noticeable beard, mustache, and eyebrows. All three coat types feature a dense, insulating undercoat that provides crucial protection during work in harsh weather conditions and cold water. Patterdale Terriers appear in several solid colors including black, red, chocolate, bronze, and liver, with black being the most commonly encountered color in the breed. Black and tan patterns and grizzle colorations also occur within the breed population. The head is wedge-shaped and strong, featuring powerful jaws with a complete scissor bite essential for the breed's demanding working purpose. The ears are small, V-shaped, and fold forward close to the cheeks, protecting the ear canal during underground work. Eyes are set wide apart and may be any color corresponding to the coat color, expressing keen intelligence and unwavering alertness. The tail may be natural or docked to a working length and is carried high when the dog is alert, excited, or actively working.
Key Characteristics
Temperament Temperament Temperament Temperament Temperament Temperament Patterdales are notably vocal dogs that will enthusiastically alert their owners to anything they deem noteworthy, making them surprisingly effective watchdogs despite their small size. Their strong prey drive means they are generally not suitable for homes with small pets such as rabbits, guinea pigs, hamsters, or cats, as their deeply ingrained hunting instincts can override even the best training. While affectionate and genuinely loyal with family members they know well, they may be reserved or cautious with strangers initially until properly introduced. This breed requires substantial daily exercise exceeding one hour of vigorous activity, along with regular mental stimulation to prevent boredom-related destructive behaviors.
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Other conditions seen in the breed include hip dysplasia, though this occurs significantly less frequently than in larger breeds due to the Patterdale's compact size and naturally athletic build. Patellar luxation, where the kneecap slides out of its normal position in the groove, affects some individuals and can range from mild cases requiring no treatment to severe cases necessitating surgical correction. Legg-Calve-Perthes disease, a condition affecting the blood supply to the femoral head of the hip joint, occasionally appears in the breed and typically affects young dogs. Additional health considerations include allergies affecting skin and coat quality, ear infections particularly in dogs with tightly folded ears, dental disease common to many small terrier breeds, and occasional cases of hypothyroidism. Regular veterinary care and appropriate health screening help ensure long, healthy lives for these spirited terriers.
Jack Russell
The Jack Russell is a small, athletic terrier standing 10 to 15 inches at the withers according to the Jack Russell Terrier Club of America, with the closely related AKC-recognized Parson Russell Terrier standing 12 to 14 inches. Weight typically ranges from 13 to 17 pounds, producing a compact, balanced dog that appears slightly longer in body than it is tall at the shoulder. The breed was specifically developed to be small enough to follow foxes into their underground dens while maintaining sufficient leg length to run with hounds and horses across varied terrain during traditional hunts. This carefully considered functional design creates a rectangular silhouette that distinguishes the breed from shorter-legged terrier varieties bred for other purposes. The head features a flat, moderately wide skull that gradually narrows toward the eyes, with a well-defined stop and powerful jaws capable of the strong grip essential for confronting quarry underground. The nose is always black, and the almond-shaped eyes appear dark with an intense, intelligent expression that conveys the breed's characteristic keen alertness and fearless nature. The small V-shaped ears fold forward at the skull level, dropping close to the head with the tips pointing toward the outside corners of the eyes, protecting the ear canals during underground work. The neck is muscular, clean, and of good length, allowing for flexibility and range of motion when navigating narrow spaces. Jack Russells display three recognized coat types that provide varying degrees of weather protection for outdoor work. The smooth coat is short, dense, and stiff to the touch with a subtle undercoat beneath. The broken coat presents an intermediate length with some longer hairs scattered throughout and may include light facial furnishings. The rough coat is longer throughout with a harsh, wiry texture and always features prominent facial furnishings including distinct eyebrows and a beard. All coat varieties share a predominantly white coloration covering at least 51 percent of the body, with markings in black, tan, or brown typically concentrated on the head and base of the tail. The chest remains small enough to be spanned by average-sized hands placed behind the front legs, an essential characteristic confirming the breed's ability to perform its original earth-working function.
Key Characteristics
Temperament Temperament Temperament Temperament Temperament Temperament Jack Russells form strong bonds with their families and display affectionate, loyal temperaments toward the people they know and trust. However, they can be assertive and may not tolerate rough handling from young children, requiring supervision during all interactions with kids. The breed shows a tendency toward dog aggression, particularly with same-sex pairings, making early socialization absolutely critical for developing appropriate social skills. Jack Russells are notably vocal dogs, using barking to communicate and alert their families, which makes them excellent watchdogs but potentially problematic in noise-sensitive environments. Their mischievous, entertaining personalities bring tremendous joy to owners fully prepared for the considerable commitment this spirited breed demands.
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Epilepsy occurs in approximately 10 percent of the Jack Russell population, with idiopathic seizures typically beginning between six months and three years of age. Progressive retinal atrophy and other eye conditions including cataracts and glaucoma require ongoing monitoring through regular veterinary eye examinations. Legg-Calve-Perthes disease affects blood supply to the femoral head of the hip joint, causing pain and lameness in young dogs that may require surgical intervention. Congenital deafness occurs more frequently in predominantly white-coated individuals due to the complex genetics of pigmentation. Additional health considerations include allergies affecting skin and digestion, dental disease related to jaw size and tooth crowding, cerebellar ataxia causing coordination problems, and occasional tracheal collapse in older individuals.
Important to Remember
Each hybrid dog is unique and may inherit any combination of traits from either parent breed. The information above represents the characteristics of the purebred parent breeds. Your Patterjack may favor one parent over the other or display a blend of both. We strongly encourage you to read the complete breed profiles for both the Patterdale Terrier and Jack Russell to fully understand the range of possible temperaments, health concerns, and care requirements.