Personally, I would not let my dogs be with ANY other dogs unless I was there and then I would STILL be hesitant. I just read something where a Chihuahua did a lot of damage to a Yorkie by latching on to it's stomach.
I even supervise MY OWN 6 since we have two older dogs who are a bit grumpy at times.
I have never been comfortable with the Doggie Day Care thing myself though I guess it works since a lot of people use it. But then I am OLD SCHOOL, and one of the 10 people left in the world that believe mothers should be home with their kids and not working till they are in school at the soonest or if they have absolultely no other choice.
Louise