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Okay so Dennis here (the naive little sap he is), ended up trusting Todd, which when reading one of the chapters, you can see the manhwa tags and it says “NON-HUMAN”. This manhwa has a setting in the west or rural setting in the 60s. Todd was most likely a shapeshifter/skinwalker, nod to the coyote we saw in earlier chapters and the one who killed that sheep. Todd sunk his claws into Dennis, taking advantage of him and once the season was over and Dennis was to return, Todd used that and took or killed all the sheep. Coyote stick in packs so he probably had others to help him take them all.