The Cardinal Stay Right Collar is light blue in color - from a color spectrum that dogs can see. Research has shown that if dogs can actually "see" the recovery collar being put around their neck, they will be less stressed and more comfortable with having to wear a foreign object around their neck during a period of recovery from an already stressful injury. This helps to calm the dog and reduces stress. Unique notches keep collar round so that your dog can"t wiggle out. Features a new easy flow air nozzle protected by strong binding. Available in X-Small, Small, Medium, Large and X-Large.