HAPPY JACKEar Canker Powder - 0.5 oz

Q: How does this product compare to Thornit?

I do not know about the "Thornit" medication; but the Happy Jack ear canker powder works. I have used it several years.

Q: contents of this powder is what?

Happy Jack Ear canker contents are Zinc Oxide 47% lodoform 3%.

Q: Will this work on a dog with yeasty ears?

I don't know what you mean by "yeasty ears" but its a good product for your dogs ear health -especially if there is excess moisture causing your dog discomfort. You might want to consider taking your dog to a veterinarian for specific advice but I think this product could help your dog -