Oh yeah, I didn't even answer your question. about 6-8 months, but some yorkies get their first heat early, some late. Uni didn't get her first cycle till 13 months! But make sure you don't spay during a heat, and make sure to get blood work done before hand too. You can check out the stickies in the health and diet forum about anesthesia protocol too.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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