Let’s make sure you get the proper size collar. Follow these simple steps for proper fit: Step 1: For a proper fit, measure your pets upper neck circumference with a cloth seamstress’s tape measure. Pull the measuring tape snug but not too tight. Step 2: Once you have determined what the neck size is of your pet, allow two fingers to slide between the tape measure and the pets neck, adjust accordingly. Step 3: All done, with the neck allowance measurement you just completed, pick the perfect collar for your beloved pet to wear.