I've heard you can use listerine mouth wash, or toothpaste with baking soda in it on your dog if it gets skunked. I don't know it works or not, but thats what I have heard. Soak the coat with mouthwash, making sure to get down to the skin with it, and then wash the dog with doggy shampoo.

Dogs with double coats take much longer to get the smell off of than normal haired dogs.