While vegetable oil is not the best in dog food it will not cause any harm in normal quantities. If possible try to get a food with animal oils, they contain many essential amino acids and fish oils contain omega 3 and 6. read more
Olive oil, Flax seed oil, and cod liver oil are excellent for dog's skins and coat. The last two can be found at health stores. Vegetable oil will help a little, but it's not nearly as healthy as the other oils. read more