Q. My dog's poop has a blood
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. Blood in the stool can be a number of things. If you're seeing blood throughout the stool, and if the stool is diarrhea, it's likely a problem in the large intestine. Could be a parasite, could be an infection, could even be cancer - not trying to scare you, just want you to know all the possibilities.
If you just saw some blood ON the stool, it could be a problem in the rectum (just inside the anus) or in the anal glands. They can get infected, and they can also have tumors as well. Bottom line, your girl needs to see a vet who can help figure out where this is coming from and what to do about it.