The main reason we, as veterinarians, suggest spaying female dogs and cats is to prevent unwanted pregnancies and to decrease the over population of non vaccinated animals. The non vaccinated animals act as infection sites to the fur babies that you, as pet owners spend hundreds of dollars spaying, neutering and vaccinating. The shelters and rescues are overwhelmed with these animals.
There has been much controversy about early spaying reducing the risk of breast cancer in dogs and cats. Some suggest that the risk of breast cancer is reduced to almost 0% in dogs spayed before their first heat. (6 months old) I personally agree with early spaying. Not only because of the reduced risk of breast cancer but the reduced risk of reproductive infections. So keep this in mind if you are shopping around for a new pet. Give them a major, life altering, act of love. Have them spayed or neutered.
M. Wayne Morris D.V.M.