Igor, 7 month old GSD puppy, has been favoring his right front paw for the last 3 days. When he sits he holds the paw off the floor. He hasn't cried out in pain at all. He bites me if I touch it but he bites me if I touch any of his paws! He limps slightly when he is walking around the apartment. I have stopped taking him on his normal walks for the time being and am trying to keep him from jumping around. I do have 5mg Prednisone on hand that I'd been giving my boy Jax. Any suggestions? Should I give him 1 prednisone? thank you.