I'm having my girls fixed this month... my crested was in heat 4 weeks ago and her hoo hoo is still swolen, and ONE teat is swollen. Hormones do NOT agree with her! I am taking her into the vet today to have the boob looked at... I think its infected?? Gone sour? I don't know! But I do know this!
She is my baby, and I am NOT risking her health to breeding. If she was bred I would still be having her fixed, the uterus would still be removed with embryos inside. I DO not want to risk her developing a uterine infection after birth that could easily kill her, or a mammary gland infection where she could lose a breast, or any other god awful condition that all of the experienced breeders can tell you about! Just going through a normal heat cycle produces a surge of hormones that screw with their bodies enough to cause cysts and cancer. I'm so fixing her!
(And this is not meant towards you just my reasoning for fixing my babies)
Add that to the fact that we have enough homeless animals and mixed breeds roaming the planet... its just senseless to bring more into the world....
Oh and when it comes to yours... Picture the head of a chi (depending on the type of chi) compared to the head of a yorkie... and your male is pretty close in size to your female... how big were your males parents? and grandparents??? I would really worry about your female passing those puppies!!! You would NEVER forgive yourself if you lost her in whelping. Its totally your choice.. but there is SO much to think about.
Whatever you chose, you know you'll have your YT family every step of the way!
