Funny you should mention this. Grizz did it just today first time I've ever seen him do it. He is intact and about 16 months old. I had him, Justice(intact male),Pike(neutered male), Kramer(9wk intact male), Ember(spayed female) and Diva(intact female who just came out of season) with me on a walk in the woods along the edge of my friends property.
Diva peed near a bush, Grizz came up and peed over the spot and scratched, Justice the alpha dog walked up behind Grizz and peed over his pee and the spot he scratched but didn't scratch himself. He did throw Grizz a look as he walked away. Like "I don't think so young man" LOL
I've never had a dog that scratched after going but I have had 2 females who lifed their legs.