I think the tyg/dog thing was a vehicle to gain sympathy for the viewer towards tyg, despite all the wrong doing he has done (killing Donna, when he thought it was opie in the truck, etc.) I had a feeling he wasn't going away when he got attached to the dog.
It reminds me of Sopranos too how Tony was sympethetic (panic attack after the ducks left the pool, the dead race horse) to animals but a sociopath to humans...
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