Still, watch it...devious little suckers, they are.
I put a terrier pup through boot camp when its owners went to Florida (I thought for five days, turned out to be seventeen days.)
By the time the dog and I parted company, she was one step away from learning circus tricks...at seven months, she was primed for the discipline and routine I provided. Her owners had this "Disney" conception of puppies. I do not.
She and I worked out the hierarchy. I may not be brighter, but I'm more stubborn.
Skip to two years later...they have her up a dog park in Madison, WI.
She decides to attack a Golden. Next trip, she goes after a lab mix, then a neighbor's shepherd. The attacks come after some minutes of playing with them at the park. Then, she brings out the stiletto.
They no longer take her to the dog park. They went through obedience training and have some sort of muzzle/leash combo they use when they walk her in the neighborhood up there.
I'd like to say I could have modified that behavior, but from what I've heard of other terrier owners, oftentimes in adulthood, terriers WANT to start a fight, even though they've never shown that tendency before.
Dunno.
But nothing quite like having a puppy to play with.
Good luck.
Kis