Leak Alert Dog

Woke up this morning to Peggy whining and found I was lying in a puddle. Thanks Peg for saving the mattress! The last two times I've had leaks I've found a split in the bag. They are only plastic lined paper and I guess maybe I scratch in my sleep? Can I rely on Peggy or should I invest in a waterproof mattress cover and endure rustling every time we move? Clare Balding tweeted the other day about Radio 4 announcers (her girlfriend Alice!) talking about 'Cross Incontinence' ( I think she means a programme about Ghana followed by one covering Mounties). I get annoyed about leaks but hope 3 times doesn't count as officially incontinent. Keep up the good work Peggy.