Silly yet funny joke

[Montana'smom]

A woman brought a very limp parrot into a veterinary clinic. As she
lay her pet on the table, the vet pulled out his stethoscope and
listened to the bird's chest. After a moment or two, the vet shook
his head sadly and said, "I'm so sorry, Polly has passed away."

The distressed owner wailed, "Are you sure? I mean, you haven't done
any testing on him or anything. He might just be in a coma or
something."

The vet rolled his eyes, shrugged, turned and left the room,
returning a few moments later with a beautiful black Labrador.

As the bird's owner looked on in amazement, the dog stood on his
hind legs, put his front paws on the examination table and sniffed
the dead parrot from top to bottom. He then looked at the vet with
sad eyes and shook his head.

The vet took the dog out, but returned a few moments later with a
cat. The cat jumped up and also sniffed delicately at the ex-bird.
The cat sat back, shook its head, meowed and ran out of the room.

The vet looked at the woman and said, "I'm sorry, but like I said,
your parrot is most definitely, 100% certifiably dead." He then
turned to his computer terminal, hit a few keys and produced a bill,
which he handed to the woman.

The parrot's owner, still in shock, took the bill. "$150?" she
cried, "$150 just to tell me my bird is dead?!!!" The vet shrugged.

"If you'd taken my word for it, the bill would only have been $20,
but with the Lab report and the Cat scan..."