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  You can spay as early as 12-16 weeks, but a lot of vets like to wait until 6 months.   She may come into heat anytime between 6 and 12 months, but I suggest not waiting until the last minute to get her spayed.  You should really have her spayed by 6 months if she's healthy or 7 months at the latest so that she doesn't come into heat before you can spay her. At 6-7 months you can have any retained baby teeth pulled as well.  
 Choose a vet that you trust and is familiar with spaying tiny dogs. In addition to a good physical exam, have a full blood panel done. This should show if there are any underlying health problems.  I also recommend a Bile Acid Test to check for liver shunt as an extra precaution and to rule out a shunt (even if she isn't showing any symptoms) just because LS is so common in yorkies and I know you said she came from a bad environment where I'm sure no health screening was done.  As long as you do all of that, there really isn't much chance of anything going wrong.  There is always a risk but rarely does anything go wrong.  And you'll be doing the best thing for her by having her spayed
 
				__________________ ~Magnifique Yorkies~Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
 Educate yourself and buy from reputable breeders or rescue.
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