In my books "Pets and the Afterlife" and "Pets and the Afterlife 2" I explain how dogs and cats have a different physiology that enables them to see and hear ghosts and spirits. As a scientist, I'm always excited by new findings, and now, new research revealed that they also can see in ultraviolet light, too!

What Cats and Dogs Can See that Humans Can’t: You Won’t Believe it!

By Kerri Fivecoat-Campbell    February 25, 2014 at 03:10PM / (129) comments

Have you ever felt that your cat or dog can see something you don’t? Well, you may be right, according to a new study.

Cats, dogs, and other mammals are thought to see in ultraviolet light, which opens up a whole different world than the one we see, the study explains.

Seeing the World in Ultraviolet (UV) Light

 UV light is the wave length beyond the visible light from red to violet that humans can see. Humans have a lens that blocks UV from reaching the retina. It was previously thought that most mammals have lenses similar to humans.

Scientists studied the lenses of dead mammals, including cats, dogs, monkeys, pandas, hedgehogs, and ferrets. By researching how much light passes through the lens to reach the retina, they concluded that some mammals previously thought not to be able to see UV actually can.

"Nobody ever thought these animals could see in ultraviolet, but in fact, they do," Ron Douglas, the study leader and a biologist at City University London, England, told LiveScience.

What purpose does being able to see UV light serve for animals such as reindeer, rodents, and other mammals? It allows reindeer to see polar bears, for example, which would be invisible in regular light because they blend in with the snow.

UV light also allows mammals to see urine trails. This would be helpful for prey animals, such as cats and dogs, to find food in the wild. (Click for original article) 

OTHER THINGS they can see - a lot of common detergents, cleansers, minerals, dyes and pigments.
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For information about how dogs and cats can see spirits and Earth-bound ghosts, check out "Pets and the Afterlife" and "Pets and the Afterlife 2" by Rob Gutro, available on Amazon.com in paperback and Kindle/E-book.