I recently brought my 11 week old boxer in for his first distemper shot. The shot was given on a Friday morning and by Sunday mid morning, my typically energetic puppy was sluggish, sleepy and unable to walk. We went to the vet first thing Monday morning and after numerous tests with no conclusions we were told to prepare to put him down. By Wednesday my puppy was back to himself running around as if nothing ever happened! Does anyone know if this could be a reaction to the vaccine? And if so, what shuld I do about the next two shots that he will need?