I was talking to my vet the other day about having Taz spayed and he told me that if you spay a dog before its first heat, the incidence of breast cancer is reduced by 100 fold, and that if you spay before the second heat, the incidence is reduced by 10 fold. After the second heat, there is no effect on the incidence of breast cancer. He said they are seeing more and more dogs with breast cancer. Have any of you ever heard this? I'm taking Taz in as soon as I can after she turns six months.