JRTs are ridiculously amazing little dogs, but are incredibly stubborn. When we rescued ours (Atlas) from the shelter, he was not even a year old. Luckily, we discovered as soon as we got him home that he was already trained, BUT, suspected he wasn't walked very often, as he was absolutely terrible on the lead. He was high energy- I would take him running with me in the morning, and the little joker would run 4 miles at a 7:30 pace. I'd go to work, come home for lunch, and play Wubba with him in the back yard. After work, I'd take him on a 2+ mile walk- and he'd still be amped up and want to play when we got home. We never crated him- he never chewed on our things, but did destroy his many toys- he was a heavy chewer. He sleeps with us (along with our Chiweenie), and they have full reign of the house. I wipe their paws and bums with baby wipes before they go into the house, and we have covers on our furniture- it's a lot more laundry (along with the bedding), but their lives are short. Atlas has slowed down a bit (he's over 8 years old), but still goes into "beast mode" and wants to run. Ours is pretty chill compared to most (he's also got some Rat Terrier and Chihuahua), but I don't think Sadie KNOWS what she is getting into- while they are ridiculously adorable, they need a LOT of exercise, attention and consistent training.