Cute video: Dog thinks glass door is closed and won't come in

When this cute pooch's owner calls for him, the way he barks to be let inside will break your heart.

The only problem? The door is actually open.

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Thankfully one of the dog's owners comes to his rescue by 'opening' the door.

This might not be the smartest dog you'll ever meet, but the internet loves him. The video has almost 4 million views in a few short days.