I use Eicosaderm by Dermapet. I think you can only get it through a vet's office.
www.dermapet.com is the website for their products. It's a fish oil/vitamin E. supplement - comes in a capsule form or a pump bottle. I just pump some out on her food every morning.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.