We have a 12 year old male poodle with a wonderful personality and very predictable behavior; however, my husband groomed him and got the hair around his tail a bit short. When he put the pup on the ground, the pup put his tail to the side and doesn't want to walk. He whimpers and suddenly jerks like he has a bug on his hip or rump but can't bite it. This is strange behavior - the vet didn't find anything. Help please.