This new collar design from Pinkaholic New York is called a turtle collar. As the name suggests, it is a collar that acts as a turtle neck for dogs. It was designed to protect the dog's neck and throat when using a collar. This Cozy Turtle collar is a tubular scarf with a removable collar and helps protect dogs against choking. It is available in Indian Pink and Light Blue in sizes ranging from small to large. It fits like a traditional collar except the tubular scarf portion that has to slide over the dog's head. . Please note that because these products were created with small/medium dog breeds in mind, larger sizes (i.e. Large, Extra-Large, etc.) do not necessarily mean larger breeds. Please refer to image of the size chart. As a general rule of thumb, if your dog falls in between sizes, it is usually better to go up a size. Weight figures are for estimates only. Always use actual measurements. <bold>IMPORTANT: </bold> Please note that when measuring your dog, the measurement for the neck must be taken at the BASE OF THE NECK and chest girth must be taken behind the front legs at the deepest (widest) part of the chest (if measuring for a harness). It is also important to take into account the size of the dog's head as well as neck girth and chest girth. Since some dogs have a much larger head than their neck, please be sure that the neck opening is large enough to slide over your dog's head.