It is important to know when a Yorkshire terrier is ready to breed, especially if you are thinking of breeding it. The Yorkie is a small breed and is usually around seven inches tall. They were initially bred to catch rodents in mine shafts. The dog usually comes in heat in six month cycles and the first one is seen when the dog is six to 18 months old. For small breeds such as the Yorkshire terrier, the first heat comes sooner.
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