Nutrient Guide
Minerals for Dogs: Calcium, Phosphorus, Zinc, Iron
Minerals are essential building blocks for your dog's bones, nerves, blood, and immune system. Learn about macro and micro minerals.
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Minerals
Macro vs. Micro Minerals
Macro (gram level): Calcium, Phosphorus, Magnesium, Sodium, Chloride, Potassium, Sulfur.
Micro (mg, µg level): Iron, Zinc, Copper, Manganese, Iodine, Selenium, Chromium.
Calcium & Phosphorus
- Function: Bones, teeth, nerve transmission, muscle contraction, blood clotting
- Sources: Bone meal, dairy, cottage cheese, fish with bones
Calcium-to-Phosphorus Ratio (Ca:P)
Ideal: 1.2:1 - 1.5:1 (Ca:P).
- Too little calcium: Osteoporosis, developmental issues
- Too much calcium: Dangerous in puppies (HD, OCD)
Calcium for Puppies
In large breed puppies, too much calcium can cause Hip Dysplasia (HD), Osteochondritis Dissecans (OCD), and Panosteitis. Never give calcium supplements to large breed puppies eating a complete puppy food.
Phosphorus & Kidney Disease
For dogs with kidney disease, reduced phosphorus (0.2-0.5% on a dry matter basis) is key.
Sodium & Potassium
- Sodium: Extracellular fluid, blood pressure. Reduced for dogs with heart disease.
- Potassium: Intracellular fluid, muscle contraction. Supplementation needed for dogs on diuretics.
Magnesium
Enzyme reactions, nervous system, bones. Reduced for dogs prone to struvite stone formation.
Zinc
- Function: Wound healing, immune system, coat quality
- Deficiency: Skin issues, slow wound healing
- Prone breeds: Siberian Husky, Alaskan Malamute
Iron
- Function: Red blood cells, oxygen transport
- Deficiency: Anemia
- Overdose: Severe toxicity with iron supplement overdose
Copper
- Function: Iron metabolism, connective tissue, melanin
- Breeds prone to copper toxicosis: Bedlington Terrier, Westie, Doberman, Labrador (certain lines)
Iodine
- Function: Thyroid hormones
- Deficiency: Hypothyroidism-like symptoms (rare)
Selenium
Antioxidant, immune system. Provided adequately in complete dog food.
General Principles of Supplementation
Dogs eating a complete and balanced dog food generally do not need mineral supplements. Justified reasons: confirmed deficiency, BARF/homemade diets, chronic illness.
Never give multiple supplements simultaneously (e.g., calcium inhibits iron absorption).
Myths
"Calcium supplements strengthen bones": False. Over-supplementation causes harm.
"More zinc means better coat": Only effective in cases of deficiency.
"Sodium is always bad": False. It's essential, but too much is harmful.
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References
- 1.National Research Council (US), Committee on Animal Nutrition — Nutrient Requirements of Dogs and Cats. National Academies Press, Washington DC, 2006. https://doi.org/10.17226/10668 (accessed: 2026-09-10)
- 2.FEDIAF (European Pet Food Industry Federation) — Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs. FEDIAF, 2024. https://europeanpetfood.org/self-regulation/nutritional-guidelines/ (accessed: 2026-09-10)
- 3.Association of American Feed Control Officials (AAFCO) — AAFCO Dog and Cat Food Nutrient Profiles. AAFCO Official Publication, 2024. https://www.aafco.org/consumers/understanding-pet-food/ (accessed: 2026-09-10)
- 4.Kealy RD, Lawler DF, Ballam JM, et al. — Five-year longitudinal study on limited food consumption and development of osteoarthritis in coxofemoral joints of dogs. Journal of the American Veterinary Medical Association 210(2):222–225, 1997. https://pubmed.ncbi.nlm.nih.gov/9018356/ (accessed: 2026-09-10)
This is general information and does not replace a veterinary diagnosis.
This guide was compiled based on the expert input of Reka Fazekas-Birizdo canine nutritionist.
Certified Canine Nutritionist