Glow Spikes Snag-proof Safety Waterproof Collar for Small Dogs and Cats - X-Small Size X-Small collar measures approx. 3/8 inch wide and adjusts for neck girth of 8 inch to 11 inch Totally funky collar for the fashion forward hound! Easy to clean - Does not Retain Dirt, Absorb Moist or Harbor Bacteria Snag-proof elastic strap allows the collar to expand if it gets caught, so your pet can safely slip out Featuring tiny rubberized spikes that glow in the dark for novelty