Yes, I would suggest giving supplements.
These are the supplements and vitamins I am giving my Baron for skin, digestion, and joints:
Nuvet Plus (required by breeder in purchase contract)
Liquid Health Naturals K9 Glucosamine I like this because of the aloe which also is good for the skin and digestion
Nordic Naturals Omega 3 for pets
Turmeric (I make the gold paste recipe here Healing Golden Turmeric Paste Recipe For Your Dog
) I don't add the pepper since I read that it can sometimes cause stomach issues.
Coconut oil (1 tsp per 10 lbs. of weight)
Optagest which is prebiotic for digestion
I did give my Sting NuPro Silver with Glucosamine. It does have flax but he had no problems with that. It also is cost effective and he did like the taste - I used to mix it with coconut oil, turmeric, and yogurt.