i have 3 puppies and i take one out for a walk once a day one by one so that each of them could have some exercise , when i return to drop off one puppy and get the other ready for her daily walk the other whines through the fence when she already had her turn . the male puppy doesn't whine much but the two female puppies do they scratch on the fence or try to dig under it , everyday is the same thing what can i do to calm them ?