Now as everyone knows... dogs love to play in the garden, trouble is, my 3 month old black lab/collie cross and 11 month old black lab love to DIG! I can't watch them all the time but my garden is turning into a game of 'trench warfare'. Can anyone please give me some advise on how to stop them? They are walked at least twice a day down the beach or in the woods and we play with them in the garden, but as soon as we go inside... the digging starts! Help!!!