Dog eyes have more rods than humans, which means they can see much better at night. Dogs also have a layer of eye tissue that humans lack called the tapetum lucidum, it reflects light into the retina.

"Some dogs don’t react well to being woken up suddenly," explains Dr. MacMillan. "They might startle easily due to their temperament or because they have a sensory issue like deafness or blindness.

With fewer cone types, dogs can't distinguish between as many colours ... Their eyes have evolved to be up to 350 times more sensitive to colour at night than ours. Although the eyes of garden snails ...

Perhaps you've sat on the couch next to your dog and wondered: What do they see when they look up at the television screen? Are they as engaged as their human counterparts? Scientists at the ...