Father Z has a pretty sad post about an Anglican minister letting communion go to the dogs. Literally.
In a way it's a natural progression -- we already have serious political discussions about whether it's all right to treat human beings as if they were dogs. We talk about putting grandma to sleep when she's too old to be worth saving, sterilizing people who've had enough kids, eliminating genetically unfit offspring.
Now that we're practicing animal husbandry on people, why not allow animals to practice religion?