Small wire mesh must be sunk two feet into the ground. Forget it if you have children around, since the plant is poisonous to people, as well. Or drop a few seeds into the burrow. Maybe he'll eat them. You have to remember to change the battery.
Gophers dislike it too.
We just bought a cabin on one of our local California mountains and poison oak is coming up everywhere ,and I am very allergic to it. Is there any way to get rid of it permanently. Don't touch the dog if he has run through it. You can't get rid of all the poison oak bushes in the whole world. Just tackle those that are located in places were you are likely to go, immediately around the house, or next to a path where you'll brush against it, for instance.