ThinkPet Reflective Breathable Soft Air Mesh Puppy Dog Vest Harness Puppy Small Dog Cat Vest Harness - The size dimension is not regular,please follow the measuring instructions before purchasing it Soft and Comfort - Soft breathable texture with no hard edges or buckles to irritate skin, reduce tugging and pulling on your pet's neck and make your pet walks comfortable Reflective Dog Cat Harness - Sealed with Reflective Piping , Generate excellent reflective effect,enhance the visibility of your dog in dark,keep your dog safe Easy to Put on - Adjustable chest belt and quick-release buckle Dimensions - Neck girth: 7.9-8.7 inches, chest girth: 11.5-13.5inches It is not accurate to charge size by weight only, So take weight and measurement all into consideration. If the size between two sizes or if your dog have stout build, please select one size larger. Concrete item size will vary from 1-3 cm, data could be regarded as a reference only.