Doesn't matter if it's fish oil, cod oil, or salmon oil - look on the label and you will see the concentrations of the two Omega-3s are equivalent. You can also find fish oil that has been concentrated 2X at a higher price of course.
Flax and Safflower oil have a low bio-equivalent amount of Omega-3s as compared to Fish oil. The host organism in this case the dog has to convert the Alpha-LNAs into long chain Omega-3s and that conversion is at best 15% of the total precusor amount. Also they contain the precursors of Omega-6 fatty acids which would cancel out some of the benefits of the Omega-3s. Stick with the fish oil.
If your dogs seem to have a lot of dry flakey skin, it might beneficial to have a thyroid panel run. Low thyroid is sometimes a problem in older small dogs. If no thyroid problem then ask your Vet for the appropriate dose of Vitamin-E to give, dry succinate salt form for better absorption.
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