My dog, Visa, isn't spayed because I show her, and trust me, having an unspayed dog is NOT for everyone. Most unspayed females become dog-aggressive. They can go through pseudo (false) pregnancies which are very stressful for her -- she will gain weight, her breasts will swell and she will lactate, nest, etc. Females in heat become very annoying. They whine constantly, they pace, they always want outdoors (so they can find a mate), they hump other dogs, people, etc. They start to mark (territorial peeing), and they become total freaks. The judge at Visa's last show excused her behaviour when she was acting like a mental freak because she was in heat. Unless you plan on showing or REPUTABLY breeding, having your dog spayed is the best thing you can do for her and you. Remember that breeding costs thousands of dollars and you will never make more than you spend, if you do it properly.