Before taking him to the groomers, did you acclimate him to having his ears, feet, and mouth touched? Has he been handled by strangers before? Has he ever had a bad experience at the vet's office? Is there any possibility he has a medical problem that is causing him pain in his ears, or somewhere else a groomer would touch?
This definitely sounds like a fear reaction to me. The question is what provoked it.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.