Size:4# (W 2.25") 4 Piece Dog Shoe Set This set of non-slip dog boots will be a good partner for them, providing traction and paw protection in harsh environments. Rottweiler and all common dogs. How to measure: ÉStep 1. Place your dog’s paw on the paper. ÉStep 2. Mark the length and width legs including toes and nails.Use the longest and widest size for a perfect fit. Note: In order to get accurate data, 4 dogs legs must be measured. Internal dimensions (inches) 1#: width 1.57 inches/4 cm 2#: width 1.77 inches/4.5 cm 3#: width 1.97 inches/ 5 cm 4#: width 2.25 inch/5.7 cm 5#: width 2.52 inch/ 6.4 cm6#: width 2.76 inch/7 cm memory allocation error: 0.11- 0.20 inches. Package includes: one pack of 4 dog boots