not just a boxer thing. Sorry!
I've seen a lot of dogs do this, and yeah... it is funny! Spotty does some good wind sprints this way (he won't poop in the yard, so we are usually off leash up in the hills).
The scraping of the ground is a sign to other dogs to "notice my posting here...." Their poop is also used to mark territory, just like their pee. You may notice that they may scrape the ground after a pee, too.
I just love the way Spotty has a BIG yawn/grin while he is doing this & bolts around..... Hubby calls it a dance... I just go "YAAAAAAAA, go,go,go,go,go,go,go!!!"
Are we totally nuts us boxer people???????
Susan