We have left our dog here over several vacations. They have dog suites and basic boarding. They allow social dogs to play together during the day, and then they go in their separate spots at night.
One time, we opted to have our dog shampooed before we picked him up. He broke out in a rash all over his skin for about a week and a half. He wasn't complaining about it, so the vet said he was fine, but I won't have that service done again. (would have given five stars, except for that issue.) Never had any issues with the boarding - just the grooming. I will take my dog here again.