Some animals are just not funny, dogs aren't funny unless they're in a pratfall, dressed in a mortifying outfit or covered in whipped cream. icanhascheeseburger has millions more rabid fans than icanhashotdog will ever have.
Cows are funny and so are sheep, but insects and fish aren't. Polar bear, panda, meerkat, penguin funny, buffalo not so much.
Pigs are always funny and here's the proof.
What more is to be said about pigs and cats.