A man runs into the vet hospital carrying his dog, screaming for help. The vet examines the still, limp body and after a few moments, tells the man that his dog, regrettably is dead. The man, clearly agitated, wasn't willing to accept this, and demands a second opinion.
The vet goes to the back room, comes out with a cat and puts the cat next to the dog's body. The cat sniffs the body, walks from head to tail, poking and sniffing and finally looks at the vet and meows.
The vet looks at the man and says "I'm sorry, but the cat thinks your dog is dead too."
The man, finally resigned to the diagnosis, thanks the vet and asks how much he owes. The vet answers "$350".
"$350 to tell me my dog is dead ?!" exclaims the man.
"Well," the vet replies, "I would have only charged you $50 for my initial diagnosis. The additional $300 was for the cat scan".