I do love fish oils/Omegas for dogs. One thing to remember is that a dog needs Vit E to process the Omega oils...so you need to either supplement w/ 10 IU Vit E (kind of a pain), or, find an oil w/ the E already in it. I like Ark Naturals Royal Coat bc it already has the E in it:
Amazon.com: Ark Naturals Royal Coat Express Omega...