Dog Rings Doorbell At 2.A.M. After Being Accidentally Left Outside (video)

Dog Rings Doorbell At 2.A.M. After Being Accidentally Left Outside (video)

Apart from being extremely adorable, dogs are also surprisingly intelligent. Studies have shown that adult dogs have a brain capacity equal to that of a 2-year-old human. Dogs can even develop behaviors fit to help the disabled and to save lives as service dogs.

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