There are some ultra sonic dog repellent devices.
Some are activated by infrared and riven by solar cells. Pretty cheap, won`t hurt the dog to much but keeps him away from your garden.
Start here:
Repellant Store They even have Coyote urine in bottles (heaven knows how they collect that :mad: ). So you can skip the lion thing in the zoo
Yust ask google for a shop in your area.
Frank