Can Fur Color Change? Cats’ fur colors can change due to various reasons, such as growth, aging, nutrition, sunlight exposure, etc. In the case of Siamese, Burmese, and Tonkinese cats, their fur colors can turn darker if the temperature around them decreases. Most Tricolor (Calico) Cats Are Female Cats’ fur colors are determined by the X chromosome. Female cats who have two X chromosomes can have two different fur colors excluding white, but male cats cannot as they have an XY chromosome pair. T