Australian Shepherd Nipping And Growling At My Son
We have a 3 1/2 year old Australian Shepherd. We've only had him three weeks. His last owners didn't have time to play with him. He is mainly my ten year old son's dog and seems to have really bonded with him more than anyone else. My son plays with him two to three hours a day everyday.
Lately he has been nipping my son but its weird because its not like he's being aggressive but today he nipped him three times pretty hard for no reason. The second he saw him he ran and knocked him over and nipped him. He also started growling at him today two times. The first time they were playing fetch and my son was walking up to him to get the ball and he growled. The second time he was extremely happy to see my son like he always is and they were loving on each other and he growled again.
I'm so confused because he loves my son but he's only doing this to my son. There is no reason for any of it. He's always excited to see my son and sad the entire time my son is gone. We aren't sure what to do. We don't believe in smacking him but we aren't sure what to do.