Thank you for your interest in Neck’s BEST THING. Apart from many pet owners and veterinarians, we have veterinary schools also using our innovative product. Please contact us, with your questions about the right product size for meeting your pet’s situation. Ideally, we would like to have a picture sent to us, along with measurements (neck circumference, height and weight, etc). Our staff of Pet owners, will make every effort to get back to you within 4 hours. You can also call us at 972-202-1012.