My vitamin mineral supplement would be fine. I order all the ingredients from Swanson Vitamins. For a small dog I’d say 1/2 tsp per day would be adequate. I use Carlson Brand cod liver oil, it has a lower vitamin a content than other brands (most brands have excessive vitamin a) and I also feel it’s higher quality than most other brands – you could give about 1/4 tsp. a couple times a week (there would be no need to add krill oil on these days as the cod liver oil has omega 3’s) for his vitamon d.
