A couple of days ago I got a 4 year old poodle mix whom is intact. I have already got a bitch (now spayed) so I know about the heat cycle to some extent. When we got her she was quite matted but I noticed that her vulva was quite swollen which I know happens when a dogs on heat. While shaving out the mats there was what looked likel old, dry blood within the mats. According to the previous owner she was last in heat in August. (Although several other months were mentioned after and the fact she has had 2 litters already; 2-3 yrs ago) Is it fair to say she's been in heat? While she's been with us she hasn't bled, been receptive, flagging or anything. (NOTE: I have already said to the vets that I want her spayed as there's plenty of animals in rescues, but if she's been/going on heat I will have to wait 3 months).