We have an 8-year old purebred female JRT named Zoby, short for Zenobia. (Her papered name is Zenobia Domino Proudfoot. Weren’t my idea, see management.)
We researched the breed extensively and knew full well what we were getting into. Being very active people, a dog willing to participate in mountain biking, hiking, trailrunning, camping, etc, was indicated. I reckon this dog would go skiing with us if it could! She can go for days.
They have boundless energy, are amazingly intelligent (ours opens doors and gates) and expect much from their people. If you are willing to provide that level of dog companionship, you’re in for a treat.
When we first got Zoby, we had been unsuccessfully trying for children and the dog was a great fit for us and very much elevated the gloominess in my wife. Guess what happened soon after Zoby arrived? I cannot recommend a JRT puppy and an infant simultaneously for any sane person, but we made it work. She and our son are the best of buddies. She has become a treasured member of our family.
We worked extensively on manners and training when she was a pup and now enjoy one of the more well-behaved JRTs with whom I have been acquainted. This is crucial. You have to do a lot of work with them and be available for daily energy burn-off sessions. If you don’t, the results will not be amusing to you or your household maintenance budget. We have had no issues, which I attribute to all the foundational work. She isn’t perfect, gets very wound up and excited when anyone new comes over for example, but she has never destroyed anything.
JRTs are exceptional at trials and agility training if you are so inclined. We once attended a JRT-specific “go to ground” competition and seeing a gang of these little firecrackers do their JRT hunting thing for which they were bred is quite a spectacle.
They are notoriously efficient ratters as well. There are documented cases of a dozen or so JRTs wiping out 5,000 rats in a single night on the docks. I’ve seen ours play hell on the field mice in our woodpile – shakes them to death in very short order and quickly finds another. She has successfully snagged full size grackles and robins that didn’t take off quick enough, too.
One thing to consider if you get one: pet health insurance. Not for health issues, for injuries. These little dogs know no fear and can be dangerously curious. I am low some S&W acquisition budget due to surprise veterinary bills generated by crazy JRT doing crazy JRT stuff. They can get hurt and it can get expensive.