I have never been bothered about the sex of my pets. I have had dogs and bitches, have loved them all and have no preference for one or the other. I have never had a bitch spayed nor a dog castrated. I now have two pups, litter brother and sister. When we were at the vets, getting their health check and second vaccinations, our vet asked if we had any plans to breed from our pups. We don't. He then advised that we have Nia, the little bitch spayed. He told us that bitches spayed before a first season seldom develope mammary tumours. A few years ago we lost a bitch to mammary cancers and I should hate to see another girl go through it. We have been using the same vet for 25+ years. He has always been excellent with our animals and up-front with us. He will not push us into having Nia spayed. He is not that sort of vet. The decision will be ours. He did say that he prefers to spay pups between 4 and 5 months of age, because the uterus and ovaries are still immature and the pup recovers more easily. As a female myself I sort of shy away from the idea of having Nia spayed, but this is illogical as I have my female cats spayed and they all go on to live long and healthy lives.. It would make life easier for us if she was spayed, in view of the fact that we have her brother. I would like to know if anyone else has had their non breeding bitches spayed and what age. Just any input at all on this topic might be useful. what are the pros and cons of early spaying. Our vet is usually up to date with recent research and development in veterinary medicine. His advice is usually sound, but I need to find out more.