Similarly, you may ask, why do cats have fangs?
Those “fangs” or upper canine teeth often protrude saber-tooth tiger style and lend some cats an intimidating smile. Yes, I'm afraid. The first teeth to erupt are the tiny front teeth or incisors and the long, pointy canines (some people still refer to them as “fangs.” Blame it on Twilight.).
One may also ask, why does my cat have double fangs? The double canine is nature's way of making sure that the growing kitten can hunt and eat normally while replace his kitten teeth with the adult version. They almost always "disappear" when the adult teeth are fully developed. They fall out when the cat bites something.
Regarding this, why do black cats have long fangs?
What I would say to be true is that the fangs LOOK long because of the contrast of white teeth against black fur. For example, I KNOW that Samson's teeth stick out of his mouth. My tuxedo cat Elvis that is a maine coon, he also has the longer teeth.
What breed of cat has fangs?
The island's most fearsome predator, the clouded leopard has the longest canine teeth of any feline, with fully-grown cats boasting fangs that are up to two-inches long. Only the long-extinct sabre-tooth tiger had longer canine teeth for its body size.