"I can't even begin to comprehend why somebody would do something like this. I don't think any of us can," animal control officer Meghan Conti told WVEC in August. "If a person's capable of taking a living, breathing animal and torturing it in this manner, what else are they capable of doing?"
At his sentencing hearing on Wednesday, Vieira, who pled guilty to the slaying in November, was similarly unable to rationalize his actions.
"I just want to say I'm sorry," Vieira told the court. "I can't explain what I did. I'm so ashamed of what I did."
To learn how you can help pass tougher animal protection laws, click here.