Reese is my big dog, a chow chow/border collie mix. He is nine and has had dry skin, allergies, and an often strong odor since we adopted him at age two. He is on a grain free and raw diet and gets fish or coconut oil daily. The vet suggested we try a people dandruff shampoo and see if that helps. We bought selsen blue with selenium sulfide and began monthly baths (previously, he got quarterly baths). I am amazed. This is month two, he scratches tons less, his fur is soft, and the smell is nearly gone. He seems much more comfortable, too.