Thanks everyone!
I was able to get a couple of pictures last night while she was relaxed and laying on her side (a rare occurance!)
In one shot, you can see another nipple further up, but the one between the two was also missing when we got her. And I was right, after looking closer - this other one is completely gone. There are still just black scabs where it was. And this is a week and a half after her groom.
Oh I forgot to mention - when my husband talked to the owner of the grooming place, she said they don't use clippers that far back by the legs, they use scissors. So if this happened at the groomer, which I'm pretty sure it did, it would have been snipped off
