How Can I Tell If My Pit Bull is Going Into Heat?

There are 4 stages to a dog's heat cycle (or estrus cycle). Understanding each stage will give you a clear indication of when your dog is going into heat.
The Stages of a Dog's Heat Cycle:Proestrus, the first stage, usually lasts 4 to 20 days. During this time, your dog is menstruating. Her secretions would be bright red, and she may shy away from other dogs. She may also tuck her tail around her vulva and have a decreased appetite. Estru