Harry definitely should have been a little less trusting about the person who gave him Politesse. But so far, the dog hasn't sprung any traps. And, of course, it's a bit of a stretch to say that whoever gave him to Harry would have known that he would give him to Draco instead of keeping him for himself.
I promise you that that will not happen. (In this story).
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I promise you that that will not happen. (In this story).