Neither.
At the very least you should be able to stand behind glass or watch by camera. We have no way of knowing how in the world they treat the dogs when they are there alone. I just wouldn't do it. There are more understanding groomers out there that will let you watch through a crack in the door or something...
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |