What do you call a dog with no legs?
Q: What do you call a dog with no legs?
A: It doesn't matter. He won't come anyway.
Unlike some legless dog jokes, this joke also has another element of humor - the answer to the question was not a name as expected, but instead the normal legless dog punchline.
If I saw an actual legless dog, this joke probably wouldn't be funny, but in the abstract it is marginally funny.