Cats can eat whole eggs, but it's recommended to feed them primarily the yolk, with small amounts of egg white only occasionally. The yolk is the most nutritious part of an egg, containing high-quality protein, vitamins, minerals, and taurine, which are very beneficial to a cat's health.

While egg whites do contain protein, the avidin in raw egg whites may interfere with a cat's absorption of vitamin B7 (biotin), leading to health problems. Therefore, it is recommended to feed cats only cooked egg whites and not in excessive amounts.