A. Dogs reach puberty at 6 months of age. Sometimes dogs can hide their systems of being in heat and can have a very irregular cycle unlike humans. I would recommend spaying your yorkie. In tact females are prone to pyometra (Infection of the uterus) which is deadly, unable to add to the number of an already overpopulated dog population, and will not have systems of heat again. Talk to your vet or call around for prices. They have low-cost spays available for low income families, check your area by asking the vets, shelters, and pet stores about your options.
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