There are already so many dogs out there without homes, please don't contribute to the problem! Too many end up in shelters. There's no good reason to breed your dog, and they live better, healthier lives if they're spayed and neutered. If you are not already a reputable AKC registered breeder (which, obviously, you are not) then do the right thing and neuter your dog, and if you get a new puppy, get it fixed too!