This size is perfectly sized for large dogs; it measures 8.85" tall and 4.75" wide and will fit up to a 3.5" wide paw.To use, add a little water, insert the muddy paw, do the twist, dab the paw dry, repeat for 3 more paws. The gentle silicone bristles will help remove dirt and mud from your dog's paws- keeping the mess in the MudBuster and not in your house. Keep the MudBuster handy after trips to the park, after walks or hikes, or by your back door.