Quick Answer: Dogs on a complete and balanced commercial diet don't need additional vitamin supplements — these foods are formulated to meet all nutritional requirements. Key vitamins are A (vision, immune function), D (bone health), E (antioxidant), K (blood clotting), and B complex (metabolism, nerve function). Over-supplementing fat-soluble vitamins A, D, E, and K can cause toxicity — always discuss supplements with your vet before adding them.
When Supplements May Help
- Dogs on home-prepared or raw diets — these may be nutritionally incomplete without guidance
- Dogs with specific diagnosed deficiencies — vet confirmed
- Senior dogs with joint issues — fish oil (omega-3) and glucosamine have good evidence
- Skin and coat issues — omega-3 fatty acids are the most consistently effective supplement
Functional Foods vs Supplements
Many beneficial nutrients come from foods you can add to meals: plain Greek yogurt (probiotics), blueberries (antioxidants), cooked eggs (complete protein), canned sardines in water (omega-3). These provide real nutritional benefit when spread on a lick mat.
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