Our dog is 9 months old and has had one season. Vet says it's fine to spay her now. I'd suppose I'd just like some reassurance that it's the right time to do it. She is such a fabulous little thing, really lovely temperament and I'm anxious that this might change her. Should we wait a while longer? Or does it not really matter? First time dog owners so just feeling our way with it and looking for advice. Thanks