He could have entropian. My bulldogge has it and is going in for surgery on friday. It is caused from the wrinkles on the face. It pushes the eyelid down and the eyelashes bug the eye. They are going to take about a half inch of skin out from under his eyebrow and raise the eyelid. It is very painful for the dog once it begins to get irritated. Not saying that is what your dog has, but maybe he should go the vet just to make sure.