High quality, adjustable cervical collar with foam padded neck. Three Velcro adjustable straps ensure quick and secure attachment. Movement is gently restricted, minimizing the effect of the dogs' bite and lick response. Superior peripheral vision. Weight of Dog Adjustable Neck Circumference* Collar Width Under 10 lbs. (4 kg) 12"-16" (30-41cm) 2.5" (6cm) 10-17 lbs. (48 kg) 14"-18" (36-45cm) 3.5" (9cm) 18-30 lbs. (8-14 kg) 19"-21" (48-53cm) 4" (10cm) 31-45 lbs. (14-21 kg) 21"-24" (53-61cm) 5" (12cm) 46-70 lbs. (21-32 kg) 23"-27" (58-68cm) 6" (15cm) 71-100 lbs. (32-45 kg) 24"-28" (61-71cm) 7" (18cm) 101-150 lbs. (45-68 kg) 28"-32" (71-81cm) 8" (20cm)