Explore the Importance of Vitamins and Minerals for Dogs and Cats in Depth

Vitamins are crucial for cell structure. Vitamins A, D, E, and K are absorbed like fat in the small intestine and stored in the liver and lipid tissue. 

Vitamin A can be converted from beta carotene, but cats do not have the enzyme to convert it. Dogs can convert beta carotene to vitamin A. The largest sources for pets are fish liver and animal liver. 

Because dogs can convert carotenoids into vitamin A, deficiencies are uncommon. In young animals, vitamin A deficiency causes abnormal bone growth as well as neurological disorders. Stenosis of the neural foramina pinches the cranial and spinal nerves as they pass through the abnormally shaped bone. If the deficiency persists, the long bones shorten and thicken, and the skull develops abnormally. 

In addition, the deficiency can cause reproductive deterioration and skin issues. 

Toxicity for dogs is very rare because the body can control its uptake and conversion of beta carotene in the small intestine.  Dogs tolerate vitamin A.  

Cats require retinyl palmitate or free retinol sourced from animal tissues. Toxicity may occur, leading to deforming cervical spondylosis, which can result in pain, lameness, and potentially crippling effects in severe instances.
 

Vitamin D is essential for calcium and phosphorus balance in the body. Many animals can make vitamin D in the skin via sun exposure, but cats and dogs need to get it in their diet. 

Vitamin D level requirements change with the developmental phase and amount of calcium and phosphorus in the diet. Large breed dogs need more vitamin D and minerals to support their body growth during the development phase. 

Too much vitamin D may cause the calcification of soft bone tissue.  Excess vitamin D cases are extremely rare. 

Vitamin E functions as an antioxidant in the body, protecting lipids. It works synergistically with selenium.  Naturally occurring deficiency is not common. Vitamin E deficiency may cause muscle degeneration, retinal degeneration, and impaired immunological response.  

High doses of vitamin E supplementation have been a beneficial treatment for skin disorders in dogs, including discoid lupus erythematosus, demodicosis, and acanthosis nigricans.  

Yellow fat disease occurs in cats that are fed diets low in vitamin E and high in polyunsaturated fats. This can happen with canned fish-based and pork brain-based diets. 

Vitamin K includes compounds called quinones, which is necessary for normal blood coagulation. Vitamin K is produced by the gut microbes. Severe antibiotic treatments can affect the production of vitamin K in the body.  Natural deficiency is extremely rare. 

Here is a clear guide from AFFCO and NRC for dosages of vitamins A, D, E, and K in the pet food. 

Water-soluble vitamins are generally not a concern for dogs and cats. Deficiency cases are very rare. Raw fish diets can destroy available thiamin in pet food due to certain enzymes. Biotin deficiency may occur with large raw egg white diets. B6 (Pyridoxine) requirement is directly related with the protein level of pet food diet. The higher the protein, the higher the B6 requirement.

Genetics can play a role, Giant Schnauzers inherited disorder causes malabsorption of vitamin B12.

Calcium and phosphorus are crucial for bone development. AFFCO suggested minimum levels of 1% calcium and 0.8% phosphorus for dogs and cats during the development and reproduction phase. 0.6% calcium and 0.5% phosphorus are recommended for adult maintenance. NRC recommends a minimum of 0.8% calcium for puppies, but this can be on the low side for the large breeds. 

For cats, a calcium-to-phosphorus ratio from 1.2:1 to 1.4:1 is considered optimal. 

As dogs and cats grow, their absorption of calcium decreases. Deficiencies are very rare considering modern pet food is well formulated. Grains containing phytate can block the absorption of calcium because it binds to calcium. It is an important point in pet food formulation. 

All-meat and organ diets can be problematic due to inadequate levels of calcium in the formulation. This can lead to demineralization of bone also because meat contains low calcium and high phosphorus. the disproportion causes nutritional secondary hyperparathyroidism. Commercially produced balanced pet food provides the complex nutrition that your pet needs. 

Magnesium is crucial for muscle and nervous system function. Naturally occurring deficiencies are not reported for dogs and cats. Excess magnesium may cause feline lower urinary tract disease. 

Copper is needed by the body for iron absorption and transport, hemoglobin formation, and normal functioning of the cytochrome oxidase enzyme system. Excess copper is excreted in bile. If there is a problem with bile, copper can accumulate in the liver and cause degenerative liver disease. 

Zinc is the most common micromineral in the body after iron. It is crucial for linoleic acid to arachidonic acid conversion. It also plays a crucial role for DNA and RNA. The lack of this element can cause growth problems in addition to skin issues. 

Sodium is a very important mineral and is lost with the urine. Unlike humans, excess sodium does not cause hypertension in dogs and cats. When hypertension does occur, it is usually secondary renal disease. Allow your pets free access to water so that they can balance their water uptake with sodium.