raw dog food
A word of caution before we proceed:
Consult your veterinarian BEFORE giving your dog any supplement or vitamin
It's hugely important not to give your dog, and especially senior ones, anything without consulting your veterinarian first if he/she has any underlying health problems or is taking any medications or other supplements. Even a 'natural' remedy could have some serious health consequences.
Even if your dog appears healthy, it's always a good idea to check with your vet before starting giving supplements, vitamins, herbal or holistic remedies, or other products. Giving supplements should be part of an overall health strategy, not the only strategy.
As someone who has licensed and consulted for licensing products with Health Canada and has over 9 years of Good Manufacturing Practices experience, I am very picky when it comes to which supplements I use and recommend. In many cases, the science supporting the supplement claims