Bulldogs World

So my little girl looks like she will be going into heat very soon... I talked to the vet today and told her that she is 9 months (next week) and that about 3 weeks ago I saw a little bit of brownish discharge. The vet said that could have been it, since it was her first time, she may not bleed a lot. All the other signs are there... has anyone ever had this before... I was waiting for a lot of blood during this time (like there was with my Mastiff - I know she is a lot bigger!!)