I would love to become a dog trainer. I have no idea where to start though. i have been trying to find a school or something but there is nothing. hmmm
If this is a recent change, has the dog been seen by a vet? When a dog is in pain they will often have a behavorial change and be more grouchy and not like being touched.
A dog would not necessarily be a bad idea in a normal museum setting but if you look at the pictures of that museum everything was displayed in such a way that it would be a huge temptation for an animal. In fact, it would be a huge temptation for a small child that was under adult supervision.