This is very confusing! I have been giving my 2 Fish4Dogs Salmon Oil for the last 6 months too, also a couple of times a week they share a small tin of pilchards mixed in with their kibble (I skip the Salmon Oil on these days). I must admit I don't give them the recommended amount, Molly, my Cocker, gets 1 teaspoon a day & Paige, my Lab/Collie cross gets 2 teaspoons whereas the recommended dose is 2 teaspoons for Molly & 3 for Paige.
So now I have to decide whether to carry on with the Salmon Oil but give them Vit E as well or do I just drop the Salmon Oil completely?
I suppose one would hope their daily food (Arden Grange both wet & dry) would have all the Vitamins they need but I have always added a bit extra, ie, chopped chicken or the odd bit of fish to make it more "interesting" for them.
Now I wonder if I am only doing them harm rather than good?!