The Extra-Small Adjustable Harness fits puppies and breeds similar to toy poodles, chihuahuas, etc. It is also a colorful and safe way to walk your pet. To use, Adjust Harness to Maximum Size, W/Leash Attachment D-Ring At top, Directed towards the Back of Animal. Place Head Through Loops. Unlock Plastic Snap & Insert Left Leg Through Shoulder Section. Bring Plastic Snap Behind Right Leg & Fasten. Finally, Adjust to Fit. Product is made with Nylon and Plastic. Product ranges in size from 10 to 16 inches.