Four years ago we had room for a couple more dogs (we top out at five). On the Humane Society web site was a photo of a pug-style cutie who reminded me of the dog we'd just lost, so we hightailed it up there. That dog was already gone, but once we'd set paw in the building, we couldn't leave without a dog.
They did have a pair of dogs labeled "chihuahuas", brother and sister. After I'd talked my husband out of a couple of yellow lab puppies, we took the chihuahuas home.