How long is a bitch in heat in season?

Female dogs go through a heat cycle, called estrus, every six months. She will have proestrus, or a bleeding cycle, before her true heat cycle during which she is very receptive to the advances of...

A female dog is typically in season for about 21 days and consists of three phases. The first phase, proestrus, is when the bloody discharge occurs. Proestrus typically lasts 7-10 days and is noted...

Well every dog is diffrent. There heat could last anywere from 9-21.

All dogs are in heat for 3 weeks.