If you think he might have been muzzled in his earlier life, he could have a muscle knot in his cheek which could be pulling the ear down. When I took in a six year old female (in 2011), she had one ear that wouldn't stand. My Massage therapist said, "I think we can get that ear to stand." She felt a kinked muscle in the cheek. I am not an MT and I couldn't really feel it. I had thought the cartilage was irretrievably broken, but she had that ear standing in about a year of once a week MT. My girl was so proud of her ears after that. She showed them off regularly.