If your little one has smelly feet because of yeast overgrowth, you can maybe consider feeding organic unrefined coconut oil daily. I give my Scottie a lick of it here and there on my fingers - he looooves it as a special treat (it's solid white but melts in your hand).
Coconut oil has been known to help any skin conditions and/or irritations for both humans and dogs. Many articles I've read say it'll boost the dog's immune system, digestive system, and make their hair silky smooth too! I personally believe in it from a holistic point of view. Just make sure to start off with small bit to avoid diarrhea
Oh and as a side note - I always wash Scottie's feet with dog shampoo after walks. He tends to pee all over his hind legs because he misses the ground when he marks :S