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The estrus cycle has four stages.

The first stage is called proestrus.

This lasts approximately 10 days and it is during this stage that your dog will bleed from the vaginal area.

This is your dog's preparation for pregnancy phase, but she will not want to mate with a male during this time.

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A dog in heat can bleed for around 7 to 10 days. During this first stage of the reproductive cycle, the female will not accept a male.

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