Also, have you provided a different place for your dog to dig. It may be
that he/she loves to dig and would leave thegarden alone if he/she had
their
own digging patch. It may not work but is perhaps worth a try.

Bad idea. That's like giving your dog an old shoe to chew on and then wonder
why you come home to all your new shoes chewed up. MOST dogs don't
understand that you can dig up anything 'here' but don't dig 'there'. You
need to teach it to not dig, period. Best way is to break the dog of digging
OR you have chosen a breed that digs not matter what because the ancestors
have spent the past 400 years or more digging up rodents and other burrowing
creatures. In that case........get used to the digging.

Val