I'd definitely visit whatever kennel you are thinking about and really interview the folks. Ask them who will be taking care of your dogs, and meet those people if you can. And from there I'd say trust your instincts. If the place smells clean, that is always a really good sign. I'd also find out if the folks who run the place live on sight. That is a huge advantage. And find out if there is anyone working there with veterinary experience like any vet techs or people who have been vet assistants before. People with that kind of experience are way more likely to notice if anything is going wrong with the dogs while they are boarding. I used to work in a kennel and I was the only person there with veterinary experience, and lets just say that a few dogs were really lucky I was working there!!!