Should I be concerned about my dog's butt hole?

He got groomed last week and he has been doing that thing where he rubs his butt hole on the carpet and drags it along a few times a day ever since. He has done this before, but very rarely. He seems fine otherwise.

I inspected it, and it isn't red or anything. It looks normal. Any experience with this? Could it be something bad or is it just an itchy butt?

EDIT: I forgot we can have gifs in the body of the post, so I have added this illustration for those unfamiliar with dog butt hole dragging.