Can animals be hypnotized?

I'm sure everyone can remember the image of the snake charmer. The fact is many, if not all animals are hypnotizable, in one way or another. Sharks can be but in a trance by simply turning them belly up. Many Chefs will put Lobsters in trance to relax their meat before boiling them.    Here is an interesting video showing some animal hypnosis: http://www.ebaumsworld.com/video/watch/316201/