It is not cod liver oil, but FISH OIL which works way different and it is exactly for arthritis.

You can find this on Amazon: Zesty Paws Omega 3 Alaskan Fish Oil Chew Treats for Dogs - with AlaskOmega for EPA & DHA Fatty Acids - Itch Free Skin - Hip & Joint Support + Heart & Brain Health

Also, CoQ10 added with it if that works out well enhances it.

I hope it works for him. The three dogs I know that are on it went from an old dog to puppy-like!