Bo-Jack
The Bo-Jack is a cross between the Boston Terrier and the Jack Russell Terrier. Because each hybrid inherits a unique combination of traits from both parents, we recommend thoroughly researching both breeds before choosing a Bo-Jack. Pay special attention to temperament, health issues, and care requirements, as your dog may express characteristics from either parent breed.
Boston Terrier
The Boston Terrier is a compact, well-balanced small dog that presents a square appearance with a distinctive tuxedo-like coat pattern that earned it the nickname "American Gentleman." Standing between 10 and 17 inches at the shoulder, this breed is divided into three weight classes: under 15 pounds, 15 to 20 pounds, and 20 to 25 pounds. The body is short and sturdy with a broad chest, well-sprung ribs, and well-muscled limbs that provide surprising strength for the breed's size. The distinctive square head features a flat skull without wrinkles, a short square muzzle, and a well-defined stop between the forehead and nose. The neck is slightly arched and carries the head gracefully, blending smoothly into the shoulders. As a brachycephalic breed, the Boston Terrier has a shortened face with large, round, dark eyes set wide apart that give the dog an intelligent, alert, and kind expression. The small, erect bat-like ears are positioned at the corners of the skull and add to the breed's distinctive silhouette. These naturally erect ears are thin and set as close to the corners of the skull as possible. The jaw is broad and square with an undershot bite that is characteristic of the breed, though the teeth and tongue should not be visible when the mouth is closed. The cheeks are flat and the stop is well-defined. The Boston Terrier's coat is smooth, short, and fine-textured, lying flat against the body and requiring minimal grooming beyond regular brushing to control moderate shedding. The distinctive coloring must be brindle, seal, or black with white markings that create the tuxedo appearance. Required white markings include a white muzzle band, a white blaze between the eyes, and white on the forechest. Ideal markings extend to include a white collar, white on the forelegs, and white below the hocks on the rear legs. The short, low-set tail is either straight or corkscrew shaped, fine and tapering, never carried above the horizontal. The limbs are straight and well-muscled with compact, round feet. The overall impression is of a dapper, well-proportioned companion dog with an unmistakable gentlemanly appearance.
Key Characteristics
Temperament Temperament Temperament Temperament Temperament Temperament While Boston Terriers are adaptable and easy-going, they can sometimes exhibit a stubborn streak that requires patient, consistent training to overcome. Early socialization helps ensure they grow into well-rounded adults. They are highly attuned to their owner's emotions and often seem to sense when comfort is needed, earning them recognition as excellent therapy dogs. Their lively yet manageable temperament, combined with their affectionate and devoted nature, has made them consistently popular as family companions and beloved household pets for over a century.
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Other health concerns include hereditary deafness, allergic dermatitis that may cause itching and skin irritation, and epilepsy. Boston Terriers have one of the highest rates of cesarean sections among dog breeds, with over 80 percent of litters requiring surgical delivery due to the puppies' large heads relative to the mother's pelvis. Responsible breeders screen for these conditions and can provide health clearances for breeding dogs. With proper care, attention to their unique respiratory needs, and regular veterinary checkups, Boston Terriers typically enjoy a lifespan of 11 to 13 years as healthy and happy companions.
Jack Russell Terrier
The Jack Russell Terrier is a small, athletic working terrier originally bred for fox hunting in England during the early 19th century. Standing between 10 and 15 inches at the shoulder and weighing 11 to 17 pounds, this compact dog possesses a body that is slightly longer than it is tall, giving it a rectangular profile essential for going to ground after quarry. The chest must be small enough to allow the dog to enter fox dens, yet the overall build remains muscular and balanced, projecting an image of strength and endurance despite the breed's modest size. The back is level and strong, supporting powerful hindquarters that enable the explosive speed and agility for which the breed is known. The head features a flat skull of moderate width that narrows gradually toward the eyes, with a well-defined stop and a powerful jaw equipped with strong teeth meeting in a scissors bite. The almond-shaped eyes are dark and expressive, conveying the breed's characteristic keen intelligence and alert demeanor. The V-shaped ears are set high on the skull and fold forward, carried close to the head with the tips pointing toward the eyes. These mobile ears contribute to the breed's expressive nature. The black nose is fully pigmented, and the overall expression is one of intense focus and readiness for action. The neck is clean and muscular, of good length, gradually widening from the head to the shoulders. Jack Russell Terriers come in three coat types: smooth, rough, and broken. The smooth coat lies flat against the body with short, dense hair. The rough coat is longer and wiry in texture with a harsh outer coat and dense undercoat. The broken coat is intermediate between the two, featuring some longer hair mixed with shorter sections, often with facial furnishings. All coat types are weatherproof and provide protection during work. The coloring is predominantly white, at least 51 percent, with tan, black, or brown markings that may appear anywhere on the body but typically concentrate on the head and tail base. The tail is set high and traditionally docked to about four inches, carried gaily but never curled over the back, serving as a handle to pull the dog from dens.
Key Characteristics
Temperament Temperament Temperament Temperament Temperament Temperament Jack Russells are vocal dogs that will bark, howl, and use various sounds to communicate. They can be aggressive toward other dogs, particularly those of the same sex, and require careful socialization from puppyhood. While they are loyal and affectionate with their families, they may be reserved or wary with strangers. These spirited terriers are best suited for active owners who understand terrier temperament and can channel their boundless energy into constructive activities such as agility, flyball, or earthdog trials.
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Epilepsy is a hereditary condition in Jack Russell Terriers, with seizures typically beginning between six months and three years of age and often manageable with lifelong anticonvulsant medication. Von Willebrand's disease, a bleeding disorder affecting blood clotting, and cerebellar ataxia, a neurological condition causing progressive loss of coordination, have also been documented in the breed. Regular veterinary care, appropriate exercise that avoids excessive jumping stress on young developing joints, and maintaining a healthy weight all contribute to ensuring Jack Russell Terriers live long, active, and healthy lives well into their senior years.
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 Bo-Jack 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 Boston Terrier and Jack Russell Terrier to fully understand the range of possible temperaments, health concerns, and care requirements.