I don't own any Chihuahuas, but my Mom has two...Sandy and Hershey (guess the colors LOL!!)

So far, neither have had any health problems...they're so healthy it's eerie!! LOL..they're indoor dogs, maybe that's the reason...anyways, they're both girls, and both were spayed at about 7-months old (they're both 3 1/2 yrs. old now). Some tips, though:

*Chihuahuas are not all-that-friendly towards strangers

*Spaying females early on is the responsible thing to do with Chihuahuas: besides the usual reasons, whelping can be dangerous - life-threatening, really - to these tiny dogs. It's best left to experienced breeders.

*One more thing...if you want a truly tiny Chihuahua, you might want to double-check their Pedigree...this breed can have huge variations in size! My Mom's Sandy is tiny (5 lbs.), but Hershey is huge! And she was pocket-certified...ironically, she's Mom's favorite...her "little darling", really, cause she's so intelligent and charming

Hope you make a good match, and good luck !!