If your horse shakes its head a lot, or rubs its ears against things, or has discharge from its ears, or has thick brown wax in its ears, you know that your horse cold have problems with its ears. The shaking of the head, rubbing of the ears and thick brown wax is more than likely just ear mites which are bugging your horse. However, if there is discharge coming from your horse’s ears, you should call your vet straight away. This discharge is more than likely the result of an infection and will need quick treatment.