First, using a soft measuring tape, measure from the very tip of your dog’s nose along the bridge of it to just below the point between dog’s eyes. Usually it is best to add approximately a quarter of an inch as you do not want the basket muzzle for dogs to be pressing right up against your pet's nose.
The second measurement you need to take is the circumference of your dog’s snout around the widest part.
Again, it’s a good idea to add another half an inch to allow free movement. Sizing is important, so please make sure you measure your dog carefully to ensure the correct size is purchased.