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It’s not unusual for people to dress up their dogs. It may be unusual for a dog to turn on its owner in a vicious way.

That what happened last week in Tampa, Fl., when Scareface, the family Pit bull mix, attacked and badly injured Brenda Guerrero, 54. He bit her in the arm and her injuries were so bad she needed surgery at a Tampa hospital to repair them.

Multiple media reports say she was attacked while trying to put a Christmas sweater on the dog.

The New York Daily News reported that Guerrero’s husband and son were both attacked when they tried to  stop the dog.  The family finally managed to flee, and Animal Control had to use a stun gun to subdue the dog.

The video by ABC13 in Tampa is chilling. It shows the dog being removed from the home covered in blood.