There is a guy who has a dog that doesn't obey him. Then he sees an ad in the paper for a great dog trainer. So, he decides to go to the dog trainer and get his dog trained.
The guy walks in the room and asks, "Can you train my dog, and are you a good trainer?" The trainer replies, "Well, I can train your dog, and I will give you a demonstration of how good I am."
He dumped a box full of bones on the floor and blew a whistle. The first dog came in and made a skeleton with the bones. "Wow!" said the guy, "What kind of dog is that?" "That's a nurse's dog," said the trainer.
Then he blows the whistle again and a second dog comes in the room. That dog makes a big building. The man says, "Wow! What kind of dog is that?" "That's an architect's dog," replies the trainer.
Then the trainer blows the whistle again and a third dog comes in. That dog takes the bones, screws the other two dogs and runs away. "Wow! What kind of dog is that?" says the man. "That's a lawyer's dog!"