Nope, not at all. Other mammals, including our own dogs and cats, synthesize vitamin D just fine because they activate it in their fur instead of their skin. We lost this option when we ditched the fur. Vitamin D deficiency is a uniquely human scourge.
Do cats get vitamins from the sun?
In contrast to humans, cats do not synthesise vitamin D in their skin in response to sunlight. Therefore, cats are dependent on dietary intake to obtain vitamin D and this nutrient is often supplemented in pet foods.