Jake is the terrier in my avatar.... He is aproximately 10 years old, I have had him for 6 years. He was dumped by the interstate by his previous owners. He was not neutured or house-trained... I took him to the vet first thing & fixed him. House broken execept for one thing. He will mark any plastic bag, I just don't leave any on the floor! He is guarding 6 2 mos old chickens in my picture. He does not hurt another "pet" in my house-hold. This includes kittens, full grown cats, puppies, and the female dogs. He does get in tussles with a part Redbone hound male, who weighs 4 times what he does and he wins! Now if there is a mole around, chipmunk, etc, all bets are off, he catches them & kills them. The only thing he does to the chickens are: roll around in their poo, eat their scraps, ie tomatoes...
I let them all free range together, just have to watch out for the UPS & Fedex guys, he does not like them, they bribe him with doggie treats.... Vet said he is part JRT & Wire-haired Toy Fox Terrier....