Some bitches will come into heat but not bleed, or only bleed a small amount. This is not abnormal. Depending on the dog, the amount and color of discharge differ. In individuals who do produce discharge, vaginal discharge may be very bloody, blood-tinged, or even pink. Towards the end of estrus, her discharge becomes watery and often comes with more mucous. By the time diestrus comes around, your bitch's discharge becomes more watery until it subsides completely. If your bitch undergoes a silent heat, she may not bleed alongside not showing other signs of estrus. During a silent heat, your bitch's vulva won't swell and she might not show interest in male dogs. Despite these unusual occurrences, a bitch in a silent heat can still get pregnant.