Talk about unholy unions. Like many couples I know, these interspecies wedding cake toppers by sculptor Megan Bogonovich are adorable and disturbing. Bogonovich also makes porcelain sculptures in the form of two-headed chickens, two-headed men (the buttocks detail on this one is particularly fetching), octo-kittens and such.
If you are someone who wishes Doctor Moreau were performing your nuptial rites, or if you're looking for a subtle way to say “My groom is an ass,” head over to Bogonovich's Etsy shop. I don't know if she does custom orders, but it might be worth asking, should you not find the specific combination you are looking for.