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As a disinterested outsider, affiliated with neither House, and therefore without any prejudice, it might be that the dog wasn't a spy at all, but an emissary of good will, with an offer of peace and good will between the two groups. This is much like the mission of the late, great, Adopt-A-Bangel, when the loyal Spuffies wised only to lead their poor lost Bangel brethren into the light of truth.