When I lived on the lot out along the river, the darned raccoons would come up along the river then out into the corn patch and eat the corn. I took a length of cable and tied it down on both ends along the river side of the garden then put a pulley on it and tied a hound dog to the pulley with a short chain. He had the run of the length of the garden. He pretty well kept the critters out.
We have coyotes and deer. Deer bed down 20 ft from the garden but never bother the garden. Small barking dog is all it takes to keep deer away. Deer are close enough to the house coyotes will not come any closer so the deer are safe all night.
There are a surprising number of cougars in Northern California. They pounce on joggers and mountain bikers now and then (because their swift motion triggers the cougar's predatory chase response). About five years ago one even descended into the culinary area of Berkeley, CA and was roaming the backyards.
Wolves I know nothing about. When predators are in short supply a sensible hunting program helps to keep the deer population in check.