My dog has had intermittent vaginal spotting ever since being spayed 5 years ago. Sometimes it is monthly and sometimes the intervals are somwhat longer. The "spotting" leaves multiple lightish-bloody spots the size of a silver dollar on my bedding. Interesting the spotting has the odor of human menstrual blood. She is as healthy as can be. Everyone, the breeder, vet, etc., thinks I am nuts, say they never heard of such a thing. I feel like cutting the fresh stains out of my sheets and taking the fabric to the vet;except I don't want to cut up my sheets. Since she has been so healthy for so many years with this ongoing spotting; I can only assume it is benign. What do you think?