Is my boxer a hermaphrodite?

Ok...so the hermaphrodite things is a little extreme. But she is 17 mo. old and hasn't gone into heat. We planned on spaying, but she had what the vet called chronic puppy vaginitis. We used so many medications, and nothing worked. So he suggested we wait until she goes into heat the first time before we spay her. He said it opens the vagina up and usually cures the vaginitis. Well, we've been waiting and waiting, and no heat. The vet thinks we just didn't notice it. Well, for one we were looking for it and expecting it. Two, my husband and I have both had female dogs and know what to look for. Three...how can it be possible to miss a boxer in heat? They have short hair, they're fairly large. And she still has the puppy vaginitis. Oh...and have you ever heard of a missing nipple from a dog? Hurley has 5 nipples on one side and 4 on the other. Is that weird? What do you guys think about all this?