My 3 yr old Male Chihuahua is getting worse by the day. Today he bit my brother in law. He is very agressive towards everyone and every animal. If I can't get something done soon I am afraid I will have to have him put down. This just kills me. Is there anyone out there that can give me some advice.
you can consider a perfessional trainer, but this is not surprising behavior for a chi. They were know for being one person dogs, and for biting. I had one as a child and he bit me 3 times in the face.
Next time choose a family dog if you want it to love everyone. socialize the dog properly as a puppy. Agression doesn't just happen, it usually happens over a period of time when the dog exibits alpha behavior and the owner allows that behavior.