Jack Russell Terrier
JAK RUH-sul TAIR-ee-ur
Fearless, Athletic, Intelligent, Vocal. Originally bred for fox bolting (going underground after foxes).
An adult Jack Russell Terrier weighs 13-17 lbs (male) or 13-17 lbs (female), needs 420-810 calories daily, and lives 12-14 yrs. As a small breed, every calorie and every ounce of body weight matters proportionally more. The breed's primary health watch is patellar luxation. All numbers below come from AKC breed standards and NRC 2006 veterinary nutrition formulas.
Nutrition and feeding
A typical adult Jack Russell Terrier needs 420 to 810 calories per day. An average male (15 lbs / 6.8 kg) needs around 600 kcal; a female (15 lbs / 6.8 kg) roughly 600 kcal. These estimates use the vet-standard RER/MER formula.
Estimate for a typical adult Jack Russell Terrier. For puppies, seniors, or specific activity levels, use the full calorie calculator.
Health profile
Smaller breeds generally live longer than large breeds, and the Jack Russell Terrier benefits from this with a life expectancy of 12-14 yrs. Their compact frames create their own set of vulnerabilities. The breed's primary health concerns are patellar luxation and deafness, which responsible breeders screen for before breeding.
Exercise and activity
60-90+ minutes of vigorous daily exercise; yes, in a dog this small. JRTs are arguably the most energetic breed per pound. Without adequate exercise, they become destructive, noisy, and neurotic. Terriers are diggers, chasers, and independent thinkers. The Jack Russell Terrier will investigate every hole, chase every squirrel, and test every boundary you set. Provide outlets for natural terrier behavior: digging pits, earth dog trials, agility, and puzzle toys that require problem-solving. Without sufficient exercise, the Jack Russell Terrier is likely to develop destructive behaviors, excessive barking, or anxiety. This is a breed that needs daily commitment to physical activity.
Care and traits
Jack Russell Terriers have a smooth, rough, or broken coat coat. Origin: England.
Don't let the small size fool you; this is a working terrier with more energy than breeds three times its size. Can jump 5+ feet from a standing position. Strong prey drive makes them dangerous to small pets. Eddie from Frasier and Wishbone were both JRTs, which boosted their popularity but also shelter surrenders.
Grooming needs are minimal. A weekly brushing to remove loose hair and distribute skin oils is sufficient for most Jack Russell Terriers. Bathing is only needed when the dog is noticeably dirty or smelly.
Their small size makes them suitable for apartment living, but they still need daily outdoor exposure and socialization. Small dogs are vulnerable to injury from rough handling, falls from furniture, and confrontations with larger animals. Supervision around young children is essential.
Tools for Jack Russell Terrier owners
Frequently asked questions
Plan for 420 to 810 calories per day for an adult Jack Russell Terrier. A 15-pound individual falls near the middle of that range. Two measured meals daily works well for most small breeds. Avoid free-feeding, as many small dogs will overeat when food is constantly available. Active dogs need more; seniors and less active individuals need less. Use our calorie calculator with your dog's actual weight for a personalized number.
Both males and females typically weigh 13-17 lbs (5.9–7.7 kg).9–7.7 kg). Small dogs hide extra weight under their coat. Pick them up regularly and feel for rib coverage as your most reliable body condition check. The best home assessment is the rib test: place your thumbs on the spine and spread your fingers across the ribs. You should feel each rib individually. If you have to press to find them, the dog is carrying extra weight.
The top health priority for Jack Russell Terrier owners is awareness of patellar luxation. Patellar luxation (slipping kneecap) is common in this size range. Maintaining a lean weight reduces stress on the knee joint. Moderate, consistent exercise strengthens the surrounding muscles. Severe cases may require surgical correction. Other conditions seen in the breed include deafness, legg-calve-perthes disease, eye problems. Awareness of these breed tendencies allows for early intervention, which often improves outcomes significantly.
The Jack Russell Terrier is built for activity and needs 60 to 90 minutes of daily exercise. Good activities for this breed include digging games, earth dog trials, fetch. Indoor play and training sessions count as legitimate exercise for dogs this size. An under-exercised Jack Russell Terrier will find outlets for pent-up energy, often in ways you will not appreciate: chewing, barking, digging, or restless pacing.
Disclaimer: General breed information based on AKC standards and veterinary sources. Individual dogs vary. Calorie estimates use the RER/MER formula (NRC 2006). Consult your veterinarian for advice specific to your dog. See our sources.
Last reviewed: April 1, 2026