Why is my dog's stool coming out with a little dark blood?

She is about 1 year old. She's been on her period for almost 3 weeks now. Yesterday, her stool came out with some dark blood. We recently changed her food brand. I know sometimes the change can upset the dogs stomach but I'm really worried if there's something wrong with her. Today she has some sort of clear mucus by where she pee's from.

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Dear Josie profile image60

Dear Josie says

4 years ago
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