If this makes you feel better about your judgement this week, I did the same! A "stereotypical" chav type boy and his staffie off lead were approaching me and I did think "Oh great!" and be cautious. Anyway he came up and we chatted and he was talking about how well his staffie has picked up training etc. His dog was lovely and so gentle with my puppy I wanted to take it home! Anyway to end the conversation he went "I have to go now, my yorkie is at the groomers and she misses me if I am late!".....so not expecting that!