I wrote about about seeing eye ponies a while back. Guide ponies are tiny, smart, and hypoallergenic, and I've been a big fan of the concept ever since Wain told me about them.
Then today a coworker told me about the miniature cows he saw recently. He said they were cuter than full-size cattle, and, due to their size, maybe slightly less stinky, but otherwise they're identical.
I searched around for a while on the subject, and it turns out there's a whole slew of mini-animals available, as well as "party ponies," which I think sounds more than a little twisted.
Personally, I'm going to wait for them to come up with party hippos. Then I'll get me a little herd of those, mix up a big batch of trashcan punch, hang up some streamers, and invite everyone over for the night of their lives.