Does your dog hate all human beings besides you and your family members? Then he is not alone. Many dogs hate their vets, groomers. This can be a real problem as you cannot avoid taking your dog to the vet or groomer. You need to teach your dog to like his vet and groomer.
Trust me, dogs normally like people, so training your dog to like his groomer and vet will not be a hard job. He needs to understand his vet and groomer are not trying to hurt him.
Lastly I want to tell you, do not worry about this at all, groomers and vets know how to handle dogs, so you do not have to worry about anything.