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Hi, this is Dr. Gabby. When the anal glands are expressed there should not be any blood unless the anal glands were infected and bloody. The groomer most likely expresses anal glands all the time so I would think they would have told you if they appeared to be infected.
Yes when a dog is in heat or has their menstral cycle the vulva becomes very swollen. Then they bleed red blood out of the vagina/vulva for about a week. Then the drainage becomes straw colored.
Does that help? Do you have any other questions for me?
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