NEW: Man saves a small dog from a violent German Shepherd by repeatedly sticking his finger up the dog's butth*le. Diabolical. The incident took place over the weekend at Roe Green Park in northwest London. Multiple people tried stopping the attack by using various techniques but it wasn't until one brave man stuck his finger up the dog's poop chute that the dog backed off. Sticking a finger up a dog's an*s is an extreme, but sometimes effective way to get the animal to drop whatever is in its mouth, according to online threads. The dog briefly stopped before he turned his attention to a different small dog and continued the attack. It's unclear what the small dogs' current condition is. It's also unclear what happened to the dog who had a surprise colonoscopy.