My girl had to stop taking our Jack Russell/Shih Tzu terrier mix to the park when we first got him because he would spontaneously attack any dog that was bigger than him. (He was a rescue and must have had some bad experiences on the street). Some days he was okay and other days he was like Kimbo Slice on steroids.
During his reign of terror he did kick much pedigree ass, but didn't draw any blood, thankfully.
It all boils down to responsibility, some owners just don't know how to handle their pets.
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