Dander isn’t always from dry skin. Dogs with seborrhea have greasy skin and lots of dander. It can be from skin irritation too, so be really careful with the Furminator, they are known for causing skin irritation. Does his white skin look pink? Is the dander coming up in certain places or all over?
For his size, a whole sardine every other day may prove to be a bit much, and you may want to try and see if getting the omegas into him consistantly helps, so you might want to try giving a third of one every day for a while and see if that helps. I would also try giving the coconut oils in smaller amounts more often.
