Find house sit in another city?

We want to go to the beach for a long weekend in the next couple. Charleston and Savannah are both reasonable distance for us. As you can see from my profile, we've been dogsitting a while and have happy customers. How can we talk to dog owners in those areas that might be willing to swap a stay at their place for free dog care while they're travelling the same time? (or we pay each other thru airbnb and rover and y'all get your cut or whatever :-) )