Size: Generally speaking, S stands for 1-2.5 kg. What it does: Prevents pets from slipping on wooden floors, protects sofas from scratches and helps weak pets get up easier. Features: Non-slip silicone on the sole provides extra grip, rubber reinforcement inside the sock for easy grip. Package & Size: A pack of 4 socks, choose the right size according to the width of your dog’s paws.