Important Sizing Note: The following measurements are the dimensions of the actual product, not of the pet they fit. After measuring your pet, make sure all measurements fit within the following dimensions (with a little room to spare in the chest and neck).
◦Chest: 10″-13″ (Most Important)
◦Pets Weighing: 3lbs.-5lbs.
◦Chest: 13″-16″ (Most Important)
◦Pets Weighing: 6lbs.-10lbs.
◦Chest: 16″-19″ (Most Important)
◦Pets Weighing: 11lbs.-15lbs.
◦Chest: 19″-21″ (Most Important)
◦Pets Weighing: 16lbs.-32lbs.
◦Chest: 21″-26″ (Most Important)
◦Pets Weighing: 33lbs.-45lbs.
◦Chest: 26″-31″ (Most Important)
◦Pets Weighing: 46lbs.-70lbs.