I'm just setting this up and wondered about this. Do you have something to confirm the dog walkers name and address? I'm not handing over the keys for a while as we trial this potential dog walker but I'm wondering what I need in terms of information from the dog walker.
I signed some kind of contract...also I know where she lives .. she also gave me a copy of some kind of insurance - the cover is in case my house keys are stolen from / lost by her, not to do with the actual dog.
However much you trust the dog walker it might be a good idea to check that s/he is insured for the cost of replacing your locks if the keys are lost.