Well, Jersey is an only child so she doesn't have another dogs ears to chew on. However, when she was a puppy, she would chew on her own ears. It was too funny. She'd lay on her side and let her ear fall into her mouth and start to chew on it.
I do think it's rather common though for dogs to chew/lick/groom each others ears.
I do think it's rather common though for dogs to chew/lick/groom each others ears.