We take our old standard poodle Minky with us on about 1/2 of our trips, usually with the camper. He's pretty old now and he gets anxious in new situations. About 4 years ago we started boarding him for short periods with his groomer, whom he adores. We have never even considered having a pet-sitter for a couple reasons: He's old and needs to have access to the "bush" whenever he needs it and he gets anxious & frightend when left alone. Frankly, I'm afraid that he would bite someone if they tried to come in while we aren't here. And that goes double if there's a thunderstorm going on.
So he goes to the groomer and he's very happy there. One of the groomers stays with the dogs 24/7. Our groomer has 4 elderly collies to hang out with in their cage-free "family dog" room. They watch Disney DVDs during the heat of the day.

She never puts Minky into the play yard with adult dogs, only the <1yo pups. There he can be the Big Dog On Campus. Those pups fall all over themselves when Minky walks through. He's very regal, like watching the Lion King or something. The adult dogs would just run him into the ground and he could really hurt himself trying to keep up with them. Minky has seizures sometimes and the groomer is very alert to that. She encourages us to call while we're gone and check on him. We have never had a problem--she even kept him for 2 months a couple years ago!