We have a 7 year old male who clings to my mother’s heels. Whenever she leaves him at home however, even for just an hour to run to the store, he runs to the door and gets excited for her to come in, wagging his tail and dancing, yet he is very aggressive to her when she walks in the door and growls like he is going to attack her if she tries to pet him. He sleeps in the bed with her and growls ferociously if she shifts, he’s bitten my father several times at night if he leaves to go to the bathroom and comes back.
Neither of the other two do this, 11 year and a 3 month old, both females. If my mother tries to pet either one of them when she gets home after he growls at her, he has been known to try and attack them.
He did not used to be like this. He was bought and previously owned by my sister but when she got married her husband didn’t want him, so he was adopted by my mother. Now he acts like this for everyone, my sister included, but especially to my mother. While at the same time he clings to her and crawls in her lap whenever she sits down. We are at a loss as what to do, or the reason why he does this. My family has owned chihuahuas, usually several at a time, nearing 50 years. And while we’ve had some mean ones, the behavior has always been either easily corrected or the trigger for their aggression easily avoided. But we do not know what to do about this, and I’m worried this will get even worse or the 3 month puppy will pick up on this behavior. She’s already picking up things from the 11 year old and mimicking them.
He is the long haired brindle in the photo. The two black ones are the girls. Do you have any suggestions for why he does this and how to correct it?