There is a guy who has a dog that doesn't obey him. He gets a recommendation for a great dog trainer and decides to go there. The dog owner walks in the room and asks, "Can you train my dog?"
The trainer replies, "Well, I can train your dog, and I will give you a quick demonstration of how I work."
He dumps a box full of bones on the floor and blows a whistle. A dog comes in and makes a skeleton with the bones.
"Wow!" says the dog owner, "What kind of dog is that?"
"That's a nurse's dog," responds the trainer.
Then he blows the whistle again and a second dog comes in the room. That dog makes a big building.
The dog owner 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 all the bones and runs away.
"What kind of dog is that?" says the dog owner.
"That's a lawyer's dog."