Possible aggressive Jack Russell puppy
I have a 14 week old Jack Russell pup who the partner of my best friend bought at the same time as they were having their first baby. He lost interest in the pup after day four, to much work, and my best friend was overwhelmed. So I took the puppy after two weeks. He is extremely bright and lovely but he had no idea when to stop biting. I led it slip for a while and now when he is really excited he doesn't stop when I do the puppy yelp. He even snapped towards my face. I tried the push him to the ground and the close his snout technique but with no lasting success. However, when he is "normal" he can be very loving just licking or nibbling. Help!