I have recently adopted a three month old German Shepherd puppy. He has recently recovered from have the parvo virus and is normal again. I have noticed one problem though. Ill be wacthing the dog (thunder) and he will be laying down perfectly relaxed. Then suddenly he will get up and run around growling and tearing stuff. It is like a sudden rush of energy. When I try to calm him down he bites me! Any idea what this is?
