You can put Tinactin on the spot. It should dry it up..... Some pets are just carriers and never show a sign but give it to others. I had it once, and they think I got it from one of my cats! No cat ever show any symptoms and has never since! It is easily treated, don't get all goofy about it. Your vet should be able to give you a cream for your doggie. It isn't as bad as mange.