Yes, the man is a dick.
He killed his pet because he was bored of it, when in reality he bought it so he should put up with the responsibility of owning it and taking care of it in a healthy manner.
You can't legally kill your child even if it was conceived on accident and you get tired of caring for your 'mistake', owning a pet falls under the same set of responsibility, only this time he never had to buy the animal in the first place. It makes no sense to punish the animal for this persons own idiocy.
I don't have a problem with him eating the animal, or if he had killed it for a legitimate reason (the current not being one of them).
Pit bulls are only violent since they are still used and bred for fighting, the person who wrote the article is an idiot.
The man who killed his dog out of boredom is just as much of an idiot, only for different reasons.