Essential Minerals for Dogs: Calcium, Zinc and More

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Minerals are the building blocks of bones and teeth, and they also regulate nerves, muscles, fluids and enzymes. Because they interact with each other, balance matters more than raw amounts. This guide covers the main players.

Macrominerals

Needed in larger quantities.

• Calcium. Builds bones and teeth and supports muscle and nerve function. Meat is low in calcium, so homemade diets need a calcium source.
• Phosphorus. Works with calcium in bones and energy metabolism. Meat and bones are high in phosphorus.
• Magnesium. Supports bone, muscle and enzyme function.
• Sodium, potassium and chloride. Regulate fluid balance and nerve signals. Dogs need small amounts of salt, but excess is dangerous. See salt poisoning in dogs.

Trace minerals

Needed in tiny amounts.

• Iron. Carries oxygen in blood. Deficiency causes anemia, and excess is toxic.
• Zinc. Supports skin, coat, wound healing and immunity. Some breeds, such as Siberian Huskies and Alaskan Malamutes, can develop zinc-responsive skin disease.
• Copper. Needed for iron use, pigment and connective tissue. Some breeds, such as Bedlington Terriers, store too much copper and develop liver disease.
• Iodine. Needed for thyroid hormone production.
• Selenium. Works with vitamin E as an antioxidant.
• Manganese, cobalt and others in small amounts.

Calcium and phosphorus balance

The ratio of calcium to phosphorus is crucial. Standards recommend a ratio of around one to one up to two to one for most diets. Too little calcium relative to phosphorus can cause bone disease, while too much calcium can interfere with bone growth, especially in large and giant breed puppies. See feeding large-breed puppies.

Why homemade diets are risky

Meat-based diets without bone or a calcium supplement are low in calcium and high in phosphorus. Adding too much supplement can cause the opposite problem. See our guide to home-cooked dog food.

Signs of deficiency or excess

• Calcium problems: Weak bones, fractures, tremors, seizures or abnormal growth.
• Iron deficiency: Pale gums, weakness, lethargy.
• Zinc deficiency: Crusty skin around the mouth, eyes and paws.
• Copper excess: Liver disease in susceptible breeds.
• Iodine problems: Thyroid disorders.
• Sodium excess: Excessive thirst, vomiting, neurological signs.

Contact your vet if you notice these.

Special diets

Dogs with kidney disease often need controlled phosphorus. See our guide to diet for dogs with kidney disease. Dogs with bladder stones may need mineral management too.

Where minerals come from

Meat, bones, organs, fish, dairy, eggs and plant ingredients contribute. Commercial diets add mineral premixes to meet standards. See AAFCO and FEDIAF standards.

Supplements

Do not add calcium or mineral supplements to a complete diet. Excess can cause harm, and interactions between minerals are complex. Only supplement under veterinary advice.

Breed and individual differences

Some breeds have particular mineral sensitivities. Bedlington Terriers, West Highland White Terriers and Labrador Retrievers can have copper handling problems, while Nordic breeds may need extra zinc for healthy skin. Large and giant breed puppies are especially sensitive to calcium levels. If your dog belongs to a breed with a known problem, ask your vet to recommend a diet and monitor with regular checkups and bloodwork.

Water and minerals

Hard water adds some calcium and magnesium, but the amounts are small compared with food. Dogs with bladder stones sometimes need adjusted mineral intake and increased water consumption. Always provide fresh, clean water, and ask your vet before changing diet for urinary problems.

Reading mineral content on the label

Labels list ash and sometimes minimum levels of calcium, phosphorus and other minerals. For most dogs this is background information, but it matters if your dog has kidney disease or is a large-breed puppy. In those cases, ask the manufacturer for the full nutrient analysis, which many companies provide on request.

The takeaway

Minerals are essential and need to be balanced. A complete diet does the work for you, so avoid guesswork.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.