Have you met the people or just spoken on the phone? Meeting them and seeing how they interact with the dog helps. Visiting them in THEIR home helps - look at the kitchen, that tells a LOT about how a person maintains things.
I know you said one lives a distance away, so that may not be a possibility.
Also make sure you have a contract which requires them to return the dog to YOU if things don't work out.
Ask who their vet is, call the vet for a reference. Ask the vet if they have been able to pay for needed services, have they brought the prior pet(s) in for routine things.
If there are special requirements for the specific dog (I don't know about your breed) ask how they will deal with that. For example, when I was looking to adopt Sugar, the bichon, I had to speak with TWO groomers during the intrview process and get an idea of what the costs will be to keep her coat trimmed. I had to provide the name and phone number of the 2 groomers I spoke with (I don't know if they were called to verify that I actually DID speak with them, but I was told that would happen. I don't use EITHER of them, I didn't like the "vibes" in the place.)
Hope this gives you some ideas to work with!
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