I gave my puppy a digging area, and he's pretty good about sticking to the same spot. But - I noticed that if any area of sod is turned up, like from animals looking for grubs, he'll also dig there too. So...I didn't actually teach him to go to just the one spot, I taught him how to avoid the nice pretty lawn, lol. Better luck next year! I toss bones into his pit, and I've refilled it a few times. He knows what, "Go diggy" means, lmao, he'll run to his area. IDK if you can get him to dig planting holes, but it's worth a try - just be careful or you'll be planting alot more than you planned on, lol.