Pet's are like people they don't want to cooperate all the time. This paw pen is for when they are biting chewing and gnawing at their feet. This usually signifies yeast is present. Twist the pen and swipe in between the toes and make it a fun game with peanut butter on your nose they won't notice the difference. Do this at night. 7 days for yeasty paws and prevention is better than the cure.