Barked: Tue Apr 21, '09 11:59am PST |
 |  |  |  | Not to alarm you, but I've read that, generally speaking, small dogs usually come into heat earlier than larger breed dogs, but each dog is an individual; Peg, a medium sized dog, was estimated to have come into her first heat at around 8 months of age (there's no way at the age she was rescued, after having a litter, that she could've had more than one heat). The risk of mammary cancer goes up after each heat until the dog reaches about 2.5 years of age, after which the altered dog appears to have the same risk of mammary cancer as an intact female dog. |  |  |  |  |
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