One Day Max was out in the Orchard playing his guitar. He heard a growling noise and looked over his shoulder. It was as he expected. It was a pack of wild dogs.
When Dolza had destroyed most life on the surface of the Earth, the surviving dogs soon went feral. They had organized themselves into new bands. These new bands of feral dogs were more complicated than the old wolf packs. Smaller dogs made up one sub-caste within the new bands: They were the ones best at opening jars and using can openers.
so Max was playing his guitar when suddenly it looked like a band of wild dogs was about to attack. He played several classic rock guitar leads. Suddenly the dogs were tamed!
"I'd better keep you guys around, just in case" said Max.
And so that was how people got dogs back.