Dogs laugh! To the human ear, it sounds like an ordinary pant, but animal behavior experts have proven that dogs actually laugh! Your dog’s peripheral vision is between 180 and 270 degrees, depending on the shape of his face and the length of his nose. Visual capabilities vary by breed, but their ability to detect size, small and rapid movements and see in low levels of light make them successful hunters. While his nose is 20 times more sensitive than yours, flavor is important to your dog. Your dog’s hearing is five times better than yours. Dogs hear up to 50,000 to 65,000 cycles per second – humans, just 20,000. You want to know why he perks up long before you hear someone walking up to the door? There you have it. Source: Beneful