I am confused as to when to have Lily spayed. My breeders says she won't go into her first heat until 8 months and wait as long as I can to give her the hormones she needs. My vet is telling me I have to have it done by 6 months so she doesn't go into heat and increase her risk of breast cancer. I have never had a female dog and don't know who to listen to. I want to do what is best for her. We are waiting for our next puppy a male and figured we would have him done around 5 months. Any suggestions?