As it happens in humans, mucus may be present in a dog's stool when the intestinal tract is irritated, inflamed or damaged. When the intestinal tract is irritated, goblet cells will produce more mucus ...

What makes your dog's poop slimy? Most likely, it's the presence of mucus. The mucus may appear as having a jelly-like consistency or it can be enveloping the dog's stool almost like a sausage casing.