One thing that you must demand in a day care is that there is a certified trainer on the premises at all times. Even if you work with your dog each day, training them, you could lose a whole week worth of work by dropping them off to a place that just lets the dogs run wild. You should also visit the place twice, once announced and then unannounced. Take a tour of the place and ask a lot of questions. You want to be sure that they have access to a vet. The real test is what it looks like when they don't expect visitors. If it looks the exact same way it did during your announced visit, then you might have a winner.