There's a lot of them, apparently. And established, popular breeds (Yorkshire terriers, shih tzus, and poodles, to name a few). These dogs just happened to have been bred to have less dander than the average dog. So don't act like it's such a big deal, Hedwig! (Was that reference obscure enough? I do my best.)
Allergic cat lovers, on the other hand, aren't so lucky. While some breeds are touted to be allergy-friendly because they have less fur, the fact is that most people are allergic to an enzyme in cat spit, so the amount of fur doesn't really matter. If you feel like waiting a year and dropping at least 8 grand, you can buy a truly hypoallergenic kitten from Allerca, a biotechnology firm. I has a mutation!