He might just be one of those dogs that doesn't like to get brushed. Or he may have a touch of arthritis that makes it painful for him to be brushed on the flanks. Have you tried a thick-toothed metal dog comb? Our guys seem to have sensitive skin, too--they didn't like the thin wire brushes but they don't mind the comb. Looks like this (without the hair
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."