What the guy did was wrong. He deserves a stiff penalty for it, and to be sent to prison.
I would have urged a 50 year sentence, one of which would be a stint in prison, with forty-nine years suspended with the provision this never happen again. He would be under the direct supervision of a parole officer for the remaining forty-nine years once out of prison.
He would be required to do 1000 hours of community service in an animal shelter.
If he was involved in any cruelty, or abuse to animals or an infraction involving harm to humans during his parole, he would serve the remaining forty-nine years of his fifty year prison sentence.
At first upon release, he would report to the parole officer once a month, then once a quarter as his demeanor was observed and it was reasoned enough to warrant it.
A guy that would do this to an animal, is highly suspect of what he would do with other life forms, particularly humans.
So five years is too long in some ways off the bat, and too short in other ways.
This guy needs to be kept on a short leash.
One year behind bars is not a cake-walk. Five years under observation is too short.
Hopefully, some big Bubba who misses his own beloved dog, will take care of this maggot.