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To select the most accurate size calming collar for your pet, measure the center of their neck with a cloth tape measure, a few inches down from their head. Pull the cloth tape measure snug, but not tight. If you don't have a cloth tape measure, you can use a piece of string and measure it with a rigid ruler afterwards. Make sure there's enough room for about two fingers between the collar and your pet's neck for comfort.
Adjust collar to fit around dog's neck by leaving approximately ¼" space between pet's neck and collar. Cut off excess portion of collar, leaving 1-2 inches for extra adjustment. For growing puppies, regularly adjust the fit of the collar to make sure it's not too tight. For all dogs, monitor daily to ensure proper fit. Using good hygiene practice, wash hands with soap and water after placing collar on dog.