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Terrier group · England, developed further in Australia

Jack Russell Terrier

Also called Jack Russell, JRT

A pocket-sized hunter with a huge work ethic that will train you if you do not train it first.

Jack Russells are bright, bold and tireless, built to follow foxes underground and still full of that instinct. They reward owners who give them structure and jobs, and they answer vague rules with digging, barking and selective hearing.

Original AI-generated breed illustration

Weight

5 to 7 kg

11 to 15 lb

Height

25 to 30 cm

at the shoulder

Life expectancy

13 to 16 yrs

Activity estimate

120 to 150 min

editorial daily planning range

Adult-size estimate

12 months

approximate model input

Life with a Jack Russell Terrier

In 1819 an Oxford student named John Russell, later a parson in Devon and a devoted fox hunter, bought a small white terrier called Trump from a local milkman. He bred from her for decades, aiming for a dog with enough leg to keep up with horses and hounds and small enough to bolt a fox from its earth without killing it. The Jack Russell descends from that working ideal, and later breeders in Britain and Australia shaped it into the standardized dog seen in show rings today.

Kennel club naming is confusing. The FCI recognizes the Jack Russell Terrier as a slightly longer-than-tall dog of 25 to 30 cm (10 to 12 in), while the taller, square-built Parson Russell is a separate breed. In the United States, the AKC registers the Russell Terrier and the Parson but nothing officially called a Jack Russell. Temperament across all three is broadly the same: fearless, busy and single-minded.

Life with one is never dull. Jack Russells notice everything, hold firm opinions and want to be involved in whatever you are doing. They are loving with their people and often great fun with children who like to throw balls, but they do not tolerate rough handling and may snap if cornered or grabbed.

What stands out

Training

Jack Russells learn quickly; the challenge is that they also decide quickly whether a task is worth doing. High-value food, games of tug and fast sessions of 5 minutes or less keep them engaged. Make training feel like hunting: hide a toy and send the dog to find it, reward a fast recall with a chase game, and turn loose-lead walking into a chance to sniff.

Read the full training guide

Easy to train

Open with strangers

Good with other dogs

A great match for

active adults who enjoy daily training
homes with a secure, dig-proof garden
owners interested in agility, flyball or earthdog trials
families with older children who like to play

Think twice if

intense prey drive toward cats, rodents and small pets
digging, barking and escaping when bored
can be scrappy with dogs of the same sex
recall disappears once a scent is found

Personality and needs at a glance

Living together

Good with children

Good with other dogs

Open with strangers

Apartment friendly

Copes with alone time

Energy and character

Energy level

Playfulness

Easy to train

Barking

5 means very vocal

Care and climate

Grooming needs

Shedding

Drooling

Handles cold

Handles heat

How much a Jack Russell Terrier eats

Illustrative calculations for neutered adults at midpoint breed weights, with food at 370 kcal per 100 g and 100 g per cup. These are not measured breed requirements. Use actual weight, the food label and veterinary body-condition advice.

Dog	Weight	Calories	Dry food
Female, relaxed lifestyle	6 kg	350 kcal	95 g (1 cups)
Female, typical pet	6 kg	400 kcal	110 g (1 cups)
Male, typical pet	7 kg	460 kcal	125 g (1.3 cups)
Male, very active	7 kg	570 kcal	155 g (1.5 cups)

Full Jack Russell Terrier feeding guide Calculate for my dog

Care guides for the Jack Russell Terrier

Feeding25 cups, split into two meals. Very active working terriers need more; a dog that mostly lounges on the sofa needs less.Read more Puppy growthGrowth is fast and fairly uncomplicated compared with bigger breeds. 4 lb) at 8 weeks, reach adult height by 8 to 10 months and are fully mature at about a year.Read more ExercisePlan for about 60 minutes of real activity a day, and keep it varied. Jack Russells are built for bursts of speed and problem solving, so flirt pole play, ball games, sniffing walks, agility and scent work suit them far better than a slow stroll.Read more GroomingAll three coat types shed, and white hair shows on everything you own. Smooth coats need a weekly rub with a rubber mitt.Read more HealthJack Russells are generally robust and long-lived, often reaching 14 or 15. The breed is known to be predisposed to primary lens luxation, patellar luxation, Legg-Calvé-Perthes disease of the hip, congenital deafness linked partly to white coat genetics, and inherited forms of ataxia.Read more

Things owners are often surprised by

1The line traces to Trump, a terrier bitch a young John Russell bought from an Oxford milkman in 1819
2Mostly white coats let hunters tell the dog apart from the fox
3A working terrier must be spannable: two hands should fit around the chest behind the elbows
4Kennel clubs now divide the type into the Jack Russell, the Parson Russell and the Russell Terrier
5Many can clear a 1.2 m (4 ft) garden fence from a standing start

Jack Russell Terrier questions

What is the difference between a Jack Russell and a Parson Russell Terrier?

Both descend from the Reverend John Russell's fox terriers. The Parson Russell is taller, about 33 to 36 cm (13 to 14 in), and square in outline, suited to running with horses. The Jack Russell under FCI rules is 25 to 30 cm (10 to 12 in) and a little longer than tall. Temperament and care needs are very similar.

Why does my Jack Russell dig so much?

Digging is exactly what the breed was selected for: following foxes and badgers underground. Many Jack Russells dig at mole runs, soft flower beds or even sofa cushions. Rather than trying to stop it completely, give your dog a sandpit or a permitted digging corner, bury toys there, and reward digging in that spot. Supervise garden time until the habit shifts.

Are Jack Russells good with cats?

Some live peacefully with a cat they grew up with, but many never lose the urge to chase. The breed was developed to hunt small animals, and that drive runs deep. Introduce any cat slowly behind a baby gate, keep early meetings short and rewarded, and never leave a Jack Russell alone with rabbits, hamsters or guinea pigs.

Is a Jack Russell a good first dog?

It can be, for a first-time owner who genuinely wants a training hobby and an active routine. It is a poor match for someone hoping for a quiet lap dog. Consider an adult rescue whose personality is already known, join a puppy class, and expect at least 18 months of consistent effort before the dog feels easy to live with.

What does spannable mean for a Jack Russell?

A working terrier needs a chest narrow and flexible enough to follow a fox underground. Breeders check this by spanning: placing both hands around the chest just behind the front legs. An average adult's thumbs and fingers should meet or nearly meet. It is a quick field test of correct build, and a heavy, barrel-chested dog would fail it.

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