Chihuahuas are seriously that small? Has that changed in the last few years - maybe knocked the top down of the standard or something?
My inlaws had a chihuahua twenty years ago and I don't remember her being much smaller than Zhi (Chinese crested, on the small side of the standard at 9 or 10 pounds). She was a freakish dog but I think raised a bit differently she would have been a neat dog. She was purchased from what I'd call a serious back yard breeder - only BYB in that they didn't show, but their dogs themselves were from show kennels and they did eyes and elbows, heart, etc on the parents. Trixie had an actual dog-shaped face rather than the smooshed one I see today - maybe the muzzle adds another pound or so? 