So I'm on the train and this guy sits down next to me. Skinny, skanky, persistent sniffle. Hood up, earphones buzzing like angry bees. You know the score. He's not the problem, though. It's the dog. A dark, tawny bull terrier with his tongue hanging out and a look in his eye that says, "You want some? I'll rip your throat out. Come on!"

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