From a game meta p.o.v. the dog (or any animal or even a depowered turret) behind a door causes collision which means the enemies line up single file and wait patiently to enter the serpentine tunnel instead of bunching up. This video from AdamVsEverything explains it: https://www.youtube.com/watch?v=eTJf0-pusxQ

I like using a guard dog in a kennel as it doesn’t break my role-play immersion like an unpowered turret would, and lines up with the pre-gunpowder forts I saw in West and South Asia that would have a guard dog kennel at the entrance.

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Cool! What’s the purpose of the door the opens onto a wall near the end of the trap tunnel where it opens onto the killbox?