The 5 Major Misconceptions About Calcium Supplementation for Cats: 90% of Cat Owners Get It Wrong! A Comprehensive Guide to Scientific Calcium Supplementation

To be honest, under normal circumstances, cats that are fed complete cat food—be it complete freeze-dried food or complete canned main course food—do not require any additional calcium supplementation. “Complete” means that all the essential nutrients a cat’s body needs are already included. However, it must be acknowledged that in a few specific situations, a cat might indeed experience calcium deficiency.

Common Situations of Calcium Deficiency in Cats

Splayed Paws May Indicate Calcium Deficiency

You may not have heard the term“splayed paws.”Cats typically stand and walk on their toes; if the surface area of their paws in contact with the ground increases, it may indicate splayed paws. As shown in the image below, severe cases of splayed paws are quite evident. Even mild cases can be detected by comparing with a normal cat.

In fact, pet owners of dogs might be more familiar with the issue of splayed paws, as the incidence is higher in dogs. Sometimes in online pet owner groups, I see videos posted by dog owners showing dogs with splayed paws; similarly, some cats also exhibit this condition, unbeknownst to their owners.

“Splayed paws”might be a sign of calcium deficiency, but it is not the only cause; it could also be a congenital issue.

If a cat that normally appears healthy suddenly shows an increase in the surface area of its paws touching the ground, and if you notice no discomfort when palpating its legs, it might be an indication that calcium supplementation is needed. Generally, liquid calcium supplements are formulated with added Vitamin D and chondroitin, but the effects of calcium supplementation are not immediate—it requires consistent administration over a period of time to see results.

Adjusting Diet During the Growth Phase

If a kitten develops splayed paws during its growth period, it is advisable to try changing its main diet. It may be that the current main food does not provide sufficient nutrient absorption, leading to inadequate calcium intake.

Calcium Supplementation May Be Necessary for Pregnant and Nursing Cats

Pregnant and postpartum cats might require additional calcium supplementation, especially since postpartum hypocalcemia (low blood calcium) can occur and needs to be addressed promptly. However, the likelihood of this situation is relatively low.

The Risks of Unnecessary Calcium Supplementation

For other healthy cats, I do not recommend that owners supplement calcium arbitrarily. Excessive calcium supplementation over a short period can place additional stress on a cat’s digestive system, and long-term supplementation might increase the risk of skeletal diseases and urinary stones.

Under normal circumstances, a cat only needs to consume a complete diet without extra calcium. However, if you choose to prepare homemade cat food and do not include bones, you will need to supplement with eggshell powder or calcium supplements to adjust the “calcium-phosphorus ratio” to ensure your cat’s health.

Misconception: Sunbathing Does Not Enhance Calcium Absorption in Cats

“Cats can absorb more calcium by sunbathing”is a misconception.

Cats differ from humans in that humans possess 7-dehydrocholesterol, which can be converted into Vitamin D through exposure to sunlight, thereby promoting calcium absorption, whereas cats lack sufficient amounts of this compound. Consequently, sun exposure does not aid in calcium supplementation for cats; the absorption of calcium in the small intestine still depends on the Vitamin D present in their diet.