1.Insert your pet collar through the inner ring loops of the cloud collar.

2.Inflate cloud collar via air valve (pinch&blow).Inflate until it feels full,but not hard.

3.Fasten collar onto your pet and use Velcro strap on the cloud collar to close.

4.Choose the larger one once the size of your pet is between two.

5.Always monitor the post-surgery pet to ensure collar is working properly.

Size: X-S Diameter:6.1"Thickness: 2.7"Neck Circumference: up to 4"

Size: Small Diameter: 7.5" Thickness: 3.3" Neck Circumference: 6"-9"

Size: Medium Diameter: 9.4" Thickness: 3.5" Neck Circumference: 8"-12"

Size: Large Diameter: 15.3" Thickness: 5.5" Neck Circumference: 12"-18"

Size: X-L Diameter: 16.9" Thickness: 5.9" Neck Circumference: 18" and up