Many veterinarians recommend a daily vitamin formulated for older dogs and cats because senior animals do not absorb nutrients from their food as efficiently as they once did. (holisticpetinfo.com)
Certain vitamins and minerals can also interfere with absorption of nutrients from food if not tracked. (nextgendog.com)
I've always been a fan of getting nutrients from food whenever possible, but in this case, it is likely much more effective too. (wellnessmama.com)