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Originally Posted by pstinard  Good point on this study ONLY referring to unspayed female dogs. It says nothing about male dogs. I *think* that this study only includes pyometra and mammary tumors because those are the "traditional" risk factors associated with not spaying, and this *is* a study of unspayed females.
I'm guessing that there wasn't an unspayed cohort for comparison because this study was conducted in Sweden, where spaying is uncommon. It would be wonderful to see a study conducted in a country where data for spayed and unspayed females are available. It would also be interesting to see a study based on age or heat cycles, and the effects of spaying before first heat. The insurance data wouldn't be able to track heat cycles, though. To use a well-worn cliche, the study is what it is  . |
Meant to say: "I'm guessing that there wasn't
a spayed cohort for comparison because..."