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Hello and thank you for using this site to help you. Blood in the stool can be an indication of parasite or protozoa which can be taken care of by medication but your Vet would have to run a test on the stool to decipher which is present so the proper meds can be given.
It can also be a sign of something more serious so it should not be ignored.
I am going to direct you to a site that will go over causes for blood in the stool.
I would take the dog to an Emergency Vet office today. Usually if your vet is not open they have a number in a message with who to take your dog to in an emergency.
It can mean there is intestinal upset or colitis.
Did the dog eat anything different before this happened?
It it bright red blood coming out?
Is he lethargic and not eating?
It sounds like the pup may have gotten into something it should not have.
I would take the vital signs and make sure they are okay. If they are fine you can monitor until tomorrow and put her on a bland diet tonight of boiled chicken and cooked white rice.
One thing to worry about is hemorrhagic gastroenteritis from eating something it is not used to and this is serious and needs vet attention.
Here is a link on how to take the vital signs so you know if you have an emergency http://www.petplace.com/dogs/what-is-normal-in-dogs/page1.aspx
I hope she feels better soon. Keep the water out for her so she continues to drink.
You are very welcome. Have a nice day.