Cat eyes glow at night because there are reflective tissues in the cat’s eyes that can reflect the light they see onto the retina, so the eyes will glow, which is normal. Moreover, cats' pupils will become larger at night, absorbing more light, and the reflection will be more obvious. If there is no light at all at night, then the cat's eyes will not be able to shine. This is the case for many cats and canines. , and so do the dogs at home.