Cats Eyes Dilated. How dilated cat eyes can signal health problems. However, if your cat’s eyes are always dilated, this usually indicates an underlying health condition.
Healthy eye dilation in cats happens when their pupils naturally grow larger in dim light or darkness and become narrower in bright environments. Also, squinting behavior and bloodshot eyes are indicators of pain in cats. If your kitty’s eyes dilate just before a fun activity, you can safely assume this is a physical manifestation of their excitement.