Why are you giving it? if you are using a good food the 3-6-9 should be balanced just right and you don't wanna mess with that over a long period of time.Not sure if this is the right spot to post so please feel free to move.
I was wondering what kind of salmon oil you give your dog. I use grizzly but it is on the expensive side so I am looking for a good alternative.
If you are using it for skin and coat you might wanna try natural lard.