This is a new one for me. I have never seen this before. Boo, my 8 year old lab mix, is chewing on Ugly's, 2 year old Chiapoo, ears. When I say chewing he puts the ear between his molars and chews like he is chewing stings off his rope. Ugly does not look hurt by it and the ears are not bleeding, he actually looks like he is loving it, like it feels good. I do weekly ear cleanings and checked Ugly's ears after Boo started chewing them and there is not one speck of anything in his ears. Any ideas why Boo is doing this?