http://www.dorwest.co.uk/vet_sup.htmKeepers Mix from Dorwest Herbs.
Personally I would use Fish Body Oil not Cod Liver Oil. Mine are in capsules from Healthspan, high DHA and EPA content. They are on the web.
You can feed in capsule or pierce and squeeze over food.
CLO contains Vitamins A & D which are fat soluble. Vit A can be toxic in large quantities and Vit D is available via the sun.
I only give CLO occasionally during the winter when my dogs are mostly out in the dark! :D
If you are raw feeding Liver provides sufficient Vitamin A.
HTH