Thanks so much everyone!

My sister spends a lot of her time brushing out his butt and tail and I do his ears, mane, legs and back. We try to kinda do it between longer period of time. Like we'll do his legs and mane then later on do his butt and ears and back. Otherwise, he gets restless and starts fidgetting. We use this wide paddle-shaped brush, a comb and a regular brush to get it all done.

Thanks again And Amber, that's another way. I never thought of that.