1st heat for Yorkies usually runs around 10-14 months.....i would wait until at least 7-8 months to spay in case she has some retained baby teeth to be removed...might as well kill 2 birds with 1 stone....you don't want to put her under more than once if you don't have to.
as far as microchipping you can do that anytime...they do not need to be put under for it...hope that helps |