i like alaskan salmon oil that you buy in the bottle. diamatacious earth is also a good natural supplement to keep help keep the parasites out. theres also a product called "solid gold sea meal" and it works great for skin & coat and also helps aid in the digestion and pro bitotics department. those along with a good quality feed should be all good for your dogs.

theres also a product out there called "red cell", but unless your puttin one through keep, i dont really see the need for it........but then again i could be blind at times! lol