- Size: 3 sizes for all types of dogs. Please use a soft tape measure to measure your dog’s neck circumference to select the correct size. The collar does not stretch, so be sure to leave a two-finger breathing space between the collar and the dog’s neck 2. Comfort: The tobeDRI dog collar is padded with 3mm neoprene for soft comfort 3. Convenient and *: Quick release with safety latch, making it easy to put on or take off the collar. Safety clasp to prevent accidental drops. 4. Reflective Stitching: Reflective stitching can maintain high visibility at night to ensure safety