[Anonymous]

The most cost effective way is to just get the human fish oil capsules at the drugstore, at present I am using Sundown Naturals 1200mg, I put 1 capsule a day in their morning meal and they chew/gulp it down. They are small dogs.
If you want to be more careful, look into salmon oil or fish oil supplements specific for dogs from pet supply places and go by the directions on the jar.

The only side effects I know of are, fish breath or loose stools, I have not observed either with my guys.