Haven't heard from you Linda, so just going to answer.
My concern, by far, is that Sandy Sue has a ruptured anal gland.
Anal glands are not visible. They sit just inside the rectum. Normally, they release this foul smelling liquid when a dog defecates. But, sometimes, they can obstructured and fill up so much that they rupture. It causes severe trauma in the rectal area, and the primary symptoms are seeing blood in the rectum or around it and trying to lick the back end a lot.
Many dogs will exhibit symptoms beforehand as well. Typically, scooting the butt on the ground or trying to lick the rectal area.
Absolutely, no further delay. This is worth an vet visit immediately. Nothing else to be done at home and I would imagine the back end is really sensitive, so I would not try to clean it.
Hope that information helps