JMHO - I believe in preventative care, so i give Jack vitamins,monthly de-worm mediccine & usually a bit of olive oil in his food.

Came across this (not too pricey) and tried it. Jack loves it, his coat is even shinier and a bit less hair
Pretty good so far. Just want to share

Iceland Pure Unscented Pharmaceutical Grade Sardine Anchovy Oil For Dogs and Cats.Bottle Size 33oz