When is a dog in heats bleeding the heaviest?

It's important to understand that a dog in heat isn't actually "bleeding," but rather experiencing a bloody discharge. This is a common part of the estrous cycle.

The heaviest discharge typically occurs during the first few days of the estrous cycle, which is when a dog is most fertile.

Here's a breakdown of the estrous cycle phases and discharge:

* Proestrus: This is the initial stage, lasting about 7-9 days, where a dog will start to experience swelling of the vulva and a bloody discharge. The discharge is often thick and bright red at this stage.

* Estrus: This is the "fertile" phase, lasting about 5-9 days. The bloody discharge will become lighter and more watery, resembling straw-colored mucus.

* Diestrus: This is the "post-heat" phase, where the discharge will gradually diminish and eventually stop.

* Anestrus: This is the resting phase between heat cycles, and there is no discharge.

It's crucial to note that every dog is different, and the amount and consistency of discharge can vary. If you have any concerns about your dog's heat cycle or discharge, it's always best to consult with your veterinarian.