Jack Russell Terrier

The FCI breed standard describes the Jack Russell as a lively, alert and active terrier, bold and fearless, friendly but quietly confident. The Royal Kennel Club stresses that even though the breed is now shown, the hope is that it stays a working terrier at heart. In other words, this isn't an ornamental dog; it's a dog chosen for a job.

According to PDSA, Jack Russells love people, often pick a "favorite person" at home and want to be with you whatever you're doing. Battersea notes that the breed is highly motivated by toys and loves tug games, but if it doesn't get enough exercise, training and mental stimulation, it can become frustrated and react strongly toward other dogs, people or wildlife.

Then there's digging. Battersea says digging is genuinely rewarding for a breed that was bred to do exactly that, and PDSA doesn't recommend the breed to anyone who takes great pride in their garden. In the AKC's breed traits, the Jack Russell (registered there as the Russell Terrier) scores at the top for energy and need for mental stimulation, and its barking level is described as "likes to be vocal."

The Jack Russell suits active households that enjoy spending time outdoors and are willing to play and train with their dog every day. Battersea is blunt about it: anyone hoping for a laid-back lapdog will find this breed demanding.

According to PDSA, Jack Russells can be less tolerant of young or boisterous children and may show frustration by nipping. Teaching children not to touch the dog's food, bed or sleep, watching play closely and giving the dog a spot to retreat to are especially important with this breed. For more, see our article on kids and dogs at home.

According to the FCI, the breed originated in 19th-century England through the efforts of the Reverend John Russell. He developed a strain of Fox Terriers that could keep up with his foxhounds and go to ground to bolt the fox from its den. Over time two types emerged: the taller, more square-built dog is now known as the Parson Russell Terrier, and the shorter-legged, slightly longer dog as the Jack Russell Terrier.

The Royal Kennel Club says these small working terriers were exported to Australia in the 1960s and 1970s, the Jack Russell Terrier Club of Australia was founded in 1972, and the breed was first shaped as a show dog there. That's why the FCI lists England as the country of origin and Australia as the country of development; the FCI recognized the breed in 1991. In the UK, the Kennel Club only officially recognized it in 2016. In the US, the AKC registers the same breed as the "Russell Terrier."

The Jack Russell is a small, strong terrier with a flexible body. According to the FCI standard, its body is slightly longer than it is tall, giving it a rectangular outline. The ears fold forward or drop, and the eyes are small, dark and almond-shaped.

• Height: According to the FCI, the ideal height at the withers is 10–12 inches (25–30 cm).
• Weight: The FCI calls for about 1 kg per 5 cm of height: a 25 cm dog should weigh about 11 lb (5 kg) and a 30 cm dog about 13 lb (6 kg). The AKC gives a range of 9–15 pounds (4–7 kg).
• Coat: There are three types: smooth (short and dense), broken (in between) and rough (longer and wiry). The standard says the coat must be weatherproof.
• Color: White must predominate, with black and/or tan markings ranging from light tan to rich chestnut.

The FCI standard treats tail docking as "optional," but rules vary by country. In Türkiye, Article 8 of Animal Protection Law No. 5199 bans cutting the tail or ears of a pet to change its appearance or for any other non-therapeutic reason; the exception is when a veterinarian considers it medically necessary. So in Türkiye, a Jack Russell keeps the tail it was born with.

Its short coat makes grooming easy. According to PDSA, a weekly brush is usually plenty, but these dogs do shed, more so in spring and fall. Rough-coated Jack Russells can have their dead hair plucked out by hand (hand-stripping) in summer; have an experienced groomer do it.

• Baths: As Dogs Trust points out, a dog that loves to dig sometimes comes home muddy; bathe with a dog shampoo when needed.
• Ears: The AKC recommends checking the ears weekly. Show your vet any redness, odor or discharge.
• Nails: The AKC suggests trimming them monthly.
• Teeth: Get your puppy used to tooth brushing early; PDSA lists pet-safe toothpaste and toothbrushes among the basic supplies.
• Yard and escapes: According to PDSA, Jack Russells are good jumpers and can squeeze through the smallest gap. Make sure your fence is tall and check it for spots where the dog could dig underneath.

For a step-by-step routine, see our guide to dog grooming.

PDSA recommends at least an hour of exercise a day for this breed: a couple of walks with plenty of sniffing and exploring, plus off-leash running in a secure, fenced area. Playtime and training should come on top of that. Battersea notes that because they're small, people often underestimate how much exercise Jack Russells need.

• Reward-based training: According to PDSA, they respond very well to reward-based training and pick up new commands quickly. The AKC stresses that they bore easily, so sessions should stay short and fun.
• Consistency: Everyone at home should follow the same rules; a clever terrier finds the loopholes fast.
• Recall: With its strong prey drive, it may not hear you once it spots a cat or a bird. Keep a firm grip on the leash and practice recall regularly; our recall training guide walks you through it.
• Barking: PDSA says the breed barks a lot when excited and that starting reward-based training early helps reduce excessive barking. To understand the cause, read why is your dog barking? In Türkiye, removing a dog's vocal cords to stop barking is also banned under Law No. 5199.
• Dog sports: According to PDSA and the AKC, the breed does very well at agility and flyball. Sniffing games also tire out its brain at home.

Jack Russells don't need a special food; a complete, balanced dog food that suits their age and activity level is enough. PDSA recommends splitting the daily amount into two meals and keeping treats under 10% of daily calories. The AKC also notes that some Russell Terriers are prone to gaining weight.

• Measure food, and subtract training treats from the daily amount.
• If you can feel the ribs under a thin layer of fat and see a waist when you look from above, the weight is right.
• Don't do intense running right after a meal; PDSA recommends leaving a gap between eating and exercise.

Some human foods are toxic to dogs; check our list of foods you should never give your dog.

The Jack Russell is generally a robust, long-lived breed, but some inherited problems have been reported. The information below is for awareness only; ask your vet about diagnosis and treatment.

Primary lens luxation (PLL)

In primary lens luxation, the fine fibers that hold the lens in place inside the eye weaken and the lens slips out of position. A 2011 study showed that the ADAMTS17 gene change linked to this disease is found in many terrier breeds, including Jack Russells, and described the condition as painful and potentially blinding. According to the Merck Veterinary Manual, if the lens drops into the front of the eye it causes sudden, severe signs, often together with raised pressure inside the eye (glaucoma). The Royal Kennel Club lists the PLL DNA test as the minimum test breeders should do before breeding. A US study in the same breed found that cataracts (clouding of the lens) and PLL are both highly heritable.

Inherited ataxias

Ataxia means loss of balance and coordination. According to a 2023 review, Jack Russells can have two inherited types: spinocerebellar ataxia (SCA), which usually starts at 2–6 months of age and causes a bouncy, almost dancing gait, and late-onset ataxia (LOA), which starts at 6–12 months and is mostly seen in Parson Russells but also in a small number of Jack Russells. Battersea notes that these conditions get worse over time and have no cure. DNA tests exist for both, and the Royal Kennel Club recommends them to breeders.

Luxating kneecap

PDSA, Battersea and the AKC all list a kneecap that slips out of place and back again (patellar luxation) among the breed's issues. According to PDSA's page on the condition, signs usually start before a year of age: the dog holds a back leg up and hops for a few seconds, then walks normally again. If you see this, take a video and show your vet; over time it can lead to arthritis in the knee.

Hearing

The AKC notes that responsible Russell Terrier breeders have their dogs' hearing tested (BAER) for deafness. When buying a puppy, it's worth asking for the parents' results.

A 2024 study using data on about 585,000 dogs from 18 UK sources found a median lifespan of 13.3 years for the Jack Russell Terrier, based on more than 13,000 Jack Russells that had died. In the same study, crossbreed dogs had a median lifespan of 12.0 years.

Another UK study from 2022, based on veterinary records, found that among the 18 breeds it examined, the Jack Russell had the longest life expectancy at birth: 12.72 years. The oldest Jack Russells in that study reached 19. The two figures are calculated in different ways, but they tell the same story: this is a breed that can live a long time. Regular vet checkups, a healthy weight and a safe life that limits avoidable risks like escaping or road accidents are the most concrete ways to protect that lifespan.

• Consider a shelter: Battersea says people often underestimate how demanding the breed is, which is why Jack Russells are frequently given up. Shelters and rescues often have adult Jack Russells whose personalities are already known. Our guide to adopting a shelter dog covers the first steps.
• If you buy from a breeder: Ask to meet the parents, and ask for the PLL, SCA and LOA DNA test results and eye exam results. Make sure the puppies are raised in a home, around people.
• Docked tails: In Türkiye, cosmetic tail docking is illegal; steer clear of anyone selling docked puppies.
• Red flags: Steer clear of sellers who won't show you the mother, always have puppies available, can't provide paperwork or rush you to "buy now."
• Registration: Rules vary by country; many places require or recommend microchipping. In Türkiye, owned dogs must be microchipped and registered in the PETVET system.
• The first days: Our guide to the first week with a new puppy walks you through the first night and first week step by step.