An animal's long, protruding nose is often called a snout. The tricky part, though, is that not all long animal noses are called snouts.
An elephant has a very long nose, but we don't call it a snout, we call it a trunk. A horse's nose is rarely referred to as a snout, because it's really their whole face that's long. Birds have beaks. Most dogs have a snout, except for pugs and boxers and other dogs with smashed-in faces. Bears have snouts, as do rats. Do yourself a favor, though, and never tell a person that they have a snout, no matter how large their nose is. Believe it or not, snout may actually be a cousin of the word snot: that should help you remember it!