The dogs' owner, Rowan Hargreaves, has said he would never forget what happened on his farm that day, and has described the dogs as his "friends and family".
During the three week trial, Crown prosecutor Joshua Shaw told the court Campbell and Mendoza went on their "commando exercise" after Mendoza's fox terrier, Otie, was mauled by a dog they believed to belong to Mr Hargreaves.
Campbell told the court he had not wanted to shoot the dogs but was begged to do it by Mr Hargreaves, something Mr Hargreaves denied.
When delivering the verdict in May, Judge Sharp said the the killings were a "massacre"
She described the scene of "pure carnage" in a cage where eight of the dogs were shot. Blood stains indicated some had bled heavily and moved to other parts of the cage in great pain before dying.
"No person in their right mind would consider it either humane or safe to shoot in a cage with eight dogs moving in it."
Judge Sharp said she "cannot actually contemplate" the way in which the men had also killed dozens of puppies.
She called Campbell a "gun-happy cowboy" who was intent on "exterminating all the dogs by any means necessary".
While Campbell took the lead in the killings, Mendoza became "fuelled by emotion and blood-lust" and participated fully.
Campbell's lawyer Barry Hart was absent from today's sentencing for health reasons.
