Karen,

My friends Rottie did this everytime he went to the vet. The Vet couldn't even get in the exam room without him growling and stuff. (he is really a teddy bear any other time)!

Anyway, the vet suggested that my friend stay in the waiting room and a tech brought him to the room. The vet suggested to my friend that he thinks he was "protecting his mommy" and without her in the room everything went very well.

I'm not sure if Logan is feeling that way or maybe he had a bad experience one too many time.