70 mumble years ago, we were on a farm, the neighbours dog was worrying the cows.
the old man caught the offending dog, wire brushed his bum, poured some turps on it and let the dog go.
did you know, a dog running on his front two legs and his bum can run faster than an 8 year old?
offer your elder brother this as an instant fix, it will wear the piles off