It's the stuff that keeps their gut healthy with good flora/bacteria. If the dog has been given antibiotics or steroids....they usually suffer from an overgrowth of yeast....which results in stinky ears and gas.
I use Dinovite which is a supplement you can order on the net without a prescription. It's in powder form and I mix it with a small amount of wet canned food. You give it every day. I also add fish oil capsules on top.
I have two dogs (mutts) who had severe flea allergies and the waxy ears. Their fur fell out and they chewed themselves.....no matter what flea product I used. The vet wanted to start them on prednisone....but I've had such bad results from that in the past with other dogs... I decided to do a little research on more natural products. It took about 3 weeks of a daily regime before I began seeing real results. Their hair came back and they stopped the chewing......plus, the ear problems disappeared. It's worth a shot!
We are sooooooooo lucky we don’t have fleas out here! but years ago when we lived down in Irvine and our dog played in the park we had real issues with them, including our cat. I found brewers yeast and garlic really helped — didn’t know back then cats were not supposed to have garlic — we also fed her ground up organ meats and heart.. the fleas left her alone after than and she had the most gorgeous black coat...