M size (neck circumference 6.5" - 10.5" diameter 11.5") is suitable for pets weighing less than 6 - 11 lbs, If your pet struggles to eat or drink with standard plastic cones, this e-collar is an ideal solution. Your pet can eat, drink, and play normally. For foot wounds, NOT JUST RECOVERY AFTER SURGERY Pets often lick their wounds. We increased the diameter of the cat cone to prevent this, even for lower limb wounds, promoting better recovery.