What is a neck cone? It is a strip of plastic that fastens together to form a cone as shown on my cat, Tigger, who has since 'crossed over the bridge." Note that the cone was secured to his collar to keep him from slipping out of it or taking it off. Cones now come in all shapes, colors, textures and sizes to fit the smallest kitten or puppy to the largest dog. The problem with this traditional kind of neck cone is that it surrounds and disables the whiskers. It also partially blocks the cats peripheral vision.