My dog has been urinating in the house for the past few days.
Today there was dark red blood all over her poop.
Is this something serious? Is she in danger? What should I do?:confused:

Blood could have been dripping from the bladder. Sounds like she has an infection, go to vet get meds. She will be OK soon

Well that's deffenatly not good! You should get her to a vet right away!

This is not the sort of thing you could do much about yourself even if we guessed what it was. Even if somebody else's dog had similar symptoms, the cure might be different. Call the vet in the morning.