Yeah.. I would say it must be.

This is part of the potty training exercise.

Why i say its a must as read this:

"Allocate a place as the potty area. Choose a place where you want your puppy to eliminate at. When you see your puppy wants to eliminate quickly bring him to the specific place. Every pup will show some signal before they want to eliminate. Every time, bring him to his potty area using the same route path. Educate him that this is the place for him to eliminate. Using the same route path is very important as this help the puppy to identify the potty area. Don't confuse your puppy by using different way to their potty area."

Danielle Chua
DOG CARE SCHOOL