Also, if the stool consistency is soft/watery and ... has several bouts of watery diarrhea (with or without blood) and especially if your dog is lethargic, not eating well and otherwise not ...

If your dog scoots constantly or you see parasites, pus, or blood in their stool, call a vet asap. Give your dog a fresh, clean carpet, and they're inevitably going to drag their butt across it.