That's my understanding, too, DD. I've heard that the risk of mammary cancer goes up by 10 percent per heat cycle However, if the risks are, say, 10 per 100,000 animals, a ten percent increase means a rise to 10.1 chances per 100,000 animals, so it's not as horrible as it sounds. Two heat cycles won't affect her cancer risks that significantly and the spay shouldn't increase the risk of mammary tumors at all as far as I know.
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