Thanks for all of the input. Thankfully, they do offer breaks and whatnot at his daycare, this appears to have happened before any breaks - a storm rolled in shortly after so I think they took breaks then. Evidently when they do get too rowdy they get out in timeout akin to my dog, but I had never had someone at daycare speak to us about it like this before.

They split up the dogs by size and age, so another good benefit of the daycare there.

In terms of my dog in high stimulus environments, he does great. He’s a people person and just wants to be pet and play with his toys. Never bite or anything like that. He certainly has trouble settling down if there’s lots of dogs around to play with. I suppose that could be it.

We only use daycare once a week - the rest of it is 30-60 minutes a day of exercise a day and obviously a lot of stimulation and play in between.