If, as you say, he is a "sociopath with no conscience," why did his girlfriend not sense this? She chose him (perhaps for his cool factor," and she loved him.
Jenna's chihuahua was a casualty of her bad choice. It appears to me that the boyfriend really wanted to choke Jenna, but instead chose to strangle the doggy to hurt her.
Anyway, he is a cruel, dangerous man, and Jenna and her family had better be careful with their actions. He just might decide to take out his anger--his uncontrollable rage-- on one of them. I would think he certainly has the capacity for a terrible revenge.
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