This is how the "big dogs" play, but make sure that her teeth won't get caught under the collar. That happened with my two females and they panicked, and we couldn't remove the collar, etc... Scary moment! Make sure that the collar is the "quick release" and always supervise their play. Don't allow the puppy to torture the older dog either...that would be unfair to the older dog who does not have endless energy of a puppy.