A noticed blood today on Ruby's vagina and on the sides of it on her coat. She is now almost 9 months and she hand't had her first heat yet. I took her to the vet on tueseday because she had been licking there a lot and then when I checked her that day I found a big drop of yellowish discharge. So that has stopped and my vet said she had dermatitis in the fold above her vagina. I haven't notice more yellow discharge anymore since then but now its the blood. Its not a lot. My vet gave me some dermal spray and medicated shampoo along with antibiotics to treat her dermatits. Now I think though that what she really has is her first heat cycle. I really don't see her vagina big though. About what size does it get when yorkies go on heat a quater,a nickel or the size of a dime. I have seen other dogs in heat before so I feel kinda stupid but I just want to be sure. Anyways I will take her to the vet again on tuesday to have a vaginal culture done and amke sure its just her heat. Any advise or answers to my confusions will be greatly appreciated.