Agressive Jack Russell
My boyfriend moved in and he has an elderly Jack that has never had ANY training, and I mean none. He didn't even know how to sit, he was allow to do whatever he wanted to do and if he was aggressive, boyfriend would just carefully coax him away. He started growling and snapping at me. If I say no (the first person ever to do so) he growls and "huffs" for an extended period. Now, he is aggressively biting me whenever he feels it is within his right. I make him always wear a leash for my protection. He has also started to poop on the floor, intentionally. I have started to hate this dog as he has bit me three times. If kenneled (first time was recent) he will bark all day long and into the night, as well as poop and pee in the kennel AND, hurt himself.
He is aggressive towards my other pets and I am concerned about my cats, because the dogs can take care of themselves; he doesn't chase them, but if he gets near them and they paw harmlessly at him, he attacks. He was intact until recently and neutering helped a little bit, but not much. He challenges me at every step of the way and dominates my super sweet BF. He is aggressive if I get too close to BF, but this has been improving with me not letting him get away with anything. BF doesn't understand dog behavior and can't read it. He lets the dog do whatever he wants. He also used to hand feed him tiny bites, so this dog didn't have to do anything, even chew.
I am trained in dog obedience and some specialized dog training, but not in aggressiveness. My BF is worried about any training as he considers it too harsh, but he is improving. Any suggestions would be greatly appreciated. I wanted to add that he has been thoroughly examined by a vet and given a clean bill of health (after I fixed his horribly teeth).