Over the past 2 weeks I have found a couple of dried puddles of brownish blood in the house - Each time I have gone over my 3 house dogs completely and found nothing. Today I found a fresh one and took a white towel and went over them again. I found a "wet spot" on the nipple of my 13 year old gal. There hasn't been any blood on her bed. Of course she is going to the vet first thing in the morning but does anyone have any thoughts on this?