In today's Viral Video of the Day, a border collie sees his reflection in a door and doesn't understand what's going on.

He does not like what he sees...

The clip shows the dog growling and staring at his reflection while staying as still as physically possible.

One viewer commented, "The fact that he looks at you through the mirror, only to go back to growling at himself just makes this so much better."

Check it out:

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Viral videos brighten up everyone's day, so be sure to laugh and then pass it on. TAG, you're it!