Elizabethan collar for pets Cute flower collar ☆ Size: L Please refer to the third image for the diameter of the neck opening. It has a soft sponge inside and is secured with Velcro, allowing for some size adjustment. I bought it, but it was too big for my dog (lol). It has only been opened, and has not been tried on. Please note that it is made overseas, so there may be loose threads.