I see his muzzle is a bit swolen from it also ? The coat on his back is awesome, and i like his rib structure and how it blends together with his loins.
My dog has some hair los on his ears the same way your boy does. Warm weather brings it out i noticed, i just keep the same feed and it dissapears in a few weeks. I've just started to ad more oils to his feed because were back into conditioning since the last month. It's kind of weird, cause his coat looks better than ever but his ears still suffer from the hairloss in this time of year.