How can I save my puppies out of my flower bed? These puppies are driving me crazy. They have destroyed most of the...

These puppies are driving me crazy. They have destroyed most of the plants outside my door. I tried putting them in a fenced nouns, but they just dig out and get hold of right back in the flower bed. What can I put surrounded by the flower bed to make them stay away from it?
I live surrounded by a awfully low rainfall...
Answers:    Dog repelant plants... Not harmfull if eatten and keeps them away from it
How much would it cost to put surrounded...
gate? borders?