One of my goats keeps shaking his head and rubbing it along the fence. I've checked him over and both his ears smell bad. They're pretty dirty inside. I need to do a better job of keeping all their ears clean to begin with, but with this one I'm fairly sure it's ear mites. Is there a way to tell without resorting to calling the vet? My vet is on vacation until after Christmas. The goat is still playful and has a healthy appetite.