The Calming Cap is a wonderful tool for easing a dogÃŒ s anxiety in high stress situations. The calming cap reduces visual stimuli and helps dogs to remain comfortable, overcome fearfulness and increase their confidence. The single panel sheet fabric window does not blind dogs, but simply filters their view. Try it for yourself ÃÂÂŒ_ youÃŒ ll see that while your vision is somewhat limited, youÃŒ re still able to comfortably and assuredly make out shapes. Quality Features: ÃÂÂŒ_ Single panel sheer fabric allows ample vision for dogs to confidently maneuver around while reducing any provoking stimuli. ÃÂÂŒ_ Soft fabric and elastic fit provide maximum comfort. ÃÂÂŒ_ Two adjustable straps allow for easy on/off use. ÃÂÂŒ_ Use with a Thundershirt when more calming is needed. X Small Snout Circumference 3" 6". Distance from "between the eyes to collar 2.5" 5" Small Snout Circumference 5" 8". Distance from "between the eyes to collar 5" 9" Medium =Snout Circumference 7" 10". Distance from "between the eyes to collar 7" 12" Large. Snout Circumference 9" 12". Distance from "between the eyes to collar 9" 16" If unsure between sizes, go with LARGER size.