Brand new sealed ? Collar can be easily inflated with a balloon pump or mouth. Put the strap side of the donut at the pet's back and orient the air valve down towards the floor to PREVENT YOUR PET FROM CHEWING UP THE VELCRO AND AIR VALVE. You can easily adjust the strap of the protective dog collar to get a perfect fit. [ Tip: Before using the donut cone for dogs after surgery, trim your pet's nails or put on socks, as their nails may puncture the collar. ] ? Medium dog cone will fit a neck circumference of 8''-12'' (20-33cm). Especially for Miniature Dachshund, Maine Coon, Boston Terrier, and Jack Russel. [TIP: MEASURE YOUR PET'S NECK CIRCUMFERENCE TO INSURE THE BEST FITTING COLLAR ] ? This is specially designed to prevent dogs from licking or biting wounds. Wearing a donut is essential for a quicker healing process and better healing of a surgical site or injury. Leaving your dog collar on all the time is the best way for your dog to get used to it. In addition, the dog recovery collar can be used in pet grooming, nail trimming, and medical services. Comfortable materials provide gentle care for pets.