I have an 80 lbs GSD and a 5-8 lbs Chihuahua. The Chihuahua constantly is putting his whole muzzle in my GSDs ears and licking them clean. The GSD has never had any ear problems, so it isn't that. I just think it's a social behavior they both seem to enjoy...who knows!
It's not the size of the dog in the fight, it's the size of the fight in the dog. Mark Twain