After weeks of trying to teach their puppy, Willow, how to use the doggy door, this couple had no idea what else to try. No matter what they did, their little puppy did not understand how to use her doggy door to get in and out of the house. But all of that changed when her older sister decided to help. If you ever wondered how intelligent and empathic animals can be, take a look at this video of an older dog teaching her baby sister to use the doggy door.
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