<human>: Hello, this is my first time posting and I really don't know if this is a suitable post for this subreddit but here it goes.

About a month and a half ago my family adopted a 3 year old male Poodle/Havanese mix. The adoption center said the dog was toy and food aggressive. They also informed us that the dog would often take to one person more than others. It didn't take us long to see that he had chosen my younger sister as his favorite family member. It also didn't take long to see just how aggressive he got around his toys. If he had a chew toy and you reached for it, he would freeze completely and let out a low, throaty growl. If we so much as patted my sister on the arm or back, he would make an aggressive jump at us. We all know dogs can be protective but he learned more towards obsessed and overly protective. About a week into owning him he bit my mother. She chalked it up to him still being new to the home and didn't think too much of it. In the days that followed he wound up snapping at my brother, my mother again, me, and my stepdad. This weekend alone he bit my sister as she was petting him and my step dad as he was reaching to pick him up. My family doesn't know what to do about his aggression. He was a stray and as cute as he is, we finally figured out why. What can we do? So far we have tried to work on his toy aggression by rewarding him when he plays fetch and using soft voices when he has a toy and we slowly reach for it. We are running on empty here.

Can you condense the text into a few key points?
<bot>: adopted dog is overly aggressive, has bit three different family members, drawing blood each time, countless attempts at biting too.