Jack Russells were bred to bolt foxes from underground dens. They needed to be fearless, fast, tenacious, and loud enough to be located by hunters above ground. None of that has been engineered out. What you are adopting is essentially a working terrier in a small, deceptively manageable-looking body.
Exercise: The Non-Negotiable
An under-exercised Jack Russell does not become lazy — it becomes creative. Digging, barking, chewing, escaping, and various other projects fill the energy void. The commonly stated "small dog, small exercise needs" does not apply here. A JRT needs at minimum 60 minutes of real exercise daily — fetch, agility, off-lead running in a secure area — plus mental stimulation. Scent work, food puzzles, and training sessions are not optional extras; they are maintenance.
Prey Drive and The Cat Question
Jack Russells have strong prey drive. Many will chase and harm small animals given the opportunity, including cats they have lived with for years if the dynamic changes. This is not aggression; it is instinct. Secure fencing is essential — they can scale surprising heights and dig under almost anything given motivation. A secure garden is not a luxury; it's a safety requirement.
Common Health Conditions
- Lens luxation: The lens of the eye detaches and moves into an abnormal position, causing pain and potentially blindness. Sudden eye redness, squinting, or clouding warrants urgent vet attention. Genetic testing is available for breeding dogs.
- Patellar luxation: Slipping kneecap — common in terriers. Watch for intermittent lameness or three-legged skipping.
- Deafness: White coat colouration genes (which many JRTs carry) are associated with congenital deafness. A BAER hearing test can confirm if you suspect any issue.
- Dental disease: Small jaw, crowded teeth — brush daily and expect professional cleans every 12-18 months.
They Learn Fast — Which Cuts Both Ways
Jack Russells are highly intelligent. They respond very well to positive reinforcement training and can learn complex behaviours quickly. The flip side: they also learn undesirable behaviours quickly, learn that certain approaches to their owner produce results, and will test boundaries consistently throughout their lives. Reward what you want. Manage what you don't. Be consistent. Inconsistency in a JRT household rapidly produces a very confident small dictator.
Jack Russell Care Summary
- 60+ minutes real exercise daily — not negotiable.
- Secure fencing minimum 1.8m; check for digging under edges.
- Daily tooth brushing — small jaw makes dental disease likely.
- BAER hearing test if any deafness suspected.
- Consistent, reward-based training from day one — this breed rewards investment in early structure.
Track your Jack Russell's health calendar and vaccine reminders on the Woofio Jack Russell care page.