Barking snakes

The Barking Snakes is a species of snake that has gained the ability to bark like a dog. It was once thought to be extinct, but more of them turned up in a salad at. Since then, they have been widely breeded. The Norwegian Seed Guard at the Svalbard Global Seed Vault was seen using them as guard dogs in The Futurama Holiday Spectacular. The snakes only appeared in a non-canon segment, so they may not exist in the real universe.