Hello! My female is a little over 2 yrs old and I am debating whether to spay or not. I have been reading some conflicting articles on spaying females. Most agree that spaying them before their first heat dramatically decreases their chances of mammary cancer ( but she has already had several heat cycles so I don't know if this would still apply to me). However, there are negatives to spaying as well. I am not worried about pregnancy b/c she is an inside dog and she is very trained and does not run off or anything like that. Any advice? Do spayed dogs live longer, healtheir lives?