Next thing you know people will be marrying cows and sheep.
Oh, that's just the beginning of this particular slippery slope. Some day soon, your next door neighbor will be outside in his driveway pronouncing vows to his '72 Barracuda. Hippys will be marrying trees. Before long you will start to see people marrying stars and other astronomical bodies. Where does it stop, people!
This always struck me a silly. When did the farm animal say "I do"? When do they consent to such activities?
No one every lists goats either, is that because they already say "nay"?