Cats are carnivores and cannot use the abundant provitamin A (carotene) in green ingredients to convert into vitamin A. Therefore, improper feeding and long-term failure to feed pig liver, fish and other foods may cause vitamin A deficiency. Cats suffering from the disease show vision loss, tearing, corneal opacity, slow movement, and indigestion. ​​​​​​

Some sick cats have symptoms such as loose stools with mucus, anemia, weakness in limbs, urinary stones, decreased reproductive function, miscarriage, or the birth of lifeless kittens with congenital abnormalities.

The prevention and treatment method for vitamin A deficiency is to pay attention to the diversification of feed. Meat and animal liver should account for a certain proportion in the feed. Sick cats can be given rich animal liver cod liver oil in a timely manner. It is necessary to ensure that each cat consumes 0.000 to 2,000 international units (300 to 600 micrograms) of vitamin A per day.