Our 4-month old Rhodesian Ridgeback has started digging under the fence in order to allow the 8-month old pug next door to play in our yard. They have great fun but unfortunately, they are creating havoc in our gardens - tearing up the plants and trees. Ginny is perfectly fine by herself and has learnt to leave the garden and plants alone - but the minute it's the two of them, they tend to egg each other on and go against what we taught Ginny. Is there some way we can curb this behaviour when they are together? And is there some way we can stop the digging?