"What," screamed the man. "How can you tell? You haven't done any testing him or anything. I want another opinion."
With that, the doctor turned and left the room. In a few minutes he returned with a Labrador Retriever. The Retriever went right to work, sniffing the poor dog on the table and checking him out thoroughly. After a considerable amount of sniffing, the Retriever sadly shook his head and went, "woof."
The veterinarian then took the Labrador out and returned in a few minutes with a cat, that walked around the poor dog several times and then sadly shook its head and said, "meow." He then jumped off the table and left the room.
The veterinarian said, "There's nothing more I can do." He handed the man a bill for $600.
The dog's owner went postal. "$600 just to tell me my dog is dead! This is outrageous!"
The doctor shook his head sadly and explained, "If you had taken my word for it, the cost would have been $50, but with the Lab work and the cat scan...it's $600.