XS: neck circumference 16-22cm, depth 6cm, S size: neck circumference 21-26cm, depth 8cm, M size: neck circumference 20-28cm, depth 10cm, L size: neck circumference 26-33cm, depth 12cm Superior Support: This Dog Collar offers exceptional neck support, especially beneficial for post-surgery recovery and pets with spinal issues. Breathable Comfort: Our collar is designed for comfort, ensuring your furry friend stays cool and relaxed during the recovery period. Prevents Scratching & Licking: Say goodbye to pesky wounds reopening. This collar is a barrier against unwanted post-op scratching and licking. Fully Adjustable: Achieve the perfect fit with our adjustable design, ensuring your pet's safety and comfort every step of the way. and move freely. For Cats and Dogs: Versatile and suitable for both cats and dogs, making it a must-have for any pet owner dealing with recovery periods.