Help me keep my dog out of my flower bed?

I've got a boxer pup and he's digging in our flower bed when we let him out. He's also eaten our crape bush. We've tried watching and getting on to him, spraying him in bum with water, and recently spread some "critter ridder" stuff-- that's basically peppers (the dog just licked it and ate some more mulch). Is there anything short of the underground electric fence that anyone knows of to stop him from eating my wife's flowers?

Help me keep my dog out of my flower bed?
Consider taking him out leashed.





I think his basic problems boredom. Boxers require a significant amount of exercise every day.





Walk him (at least a mile), then train him (squirt bottle with water when he enters unapproved space). Then, when he does something correctly, give him praise/affection/treats.





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Reply:How would you like to be sprayed up the rear end with cold water ? thats not very nice, cant you just fence it in till he is a bit bigger?
Reply:My dog likes to garden too, we finally had to put up a small fence around the flower beds, my husband made small posts then attached chicken wire to it.
Reply:Chicken wire layed onto ground in front of the flower bed. A pup will still run on it a few times but soon will decide it is not fun. Otherwise, may have to put up a fence.