Magnum's breeder is always willing to board. I've only had to do it once (for four days), but he came back his normal, happy self. Although I'm sure he didn't get the human lovin' he gets here at home, he got a lot of doggy interaction, which he doesn't get here at home.
Since Mag's breeder is within a 1/2-hour drive from us, it was a no brainer. I realize that that's not generally possible, but, if you're close enough, it's definitely something to check out.
Also, since we didn't get Magnum 'til he was over a year old, he was very acclimated to his breeder's environment. When we dropped him off, he was so happy to see his breeder and her family and his old-time buddies, he didn't even wave good-bye to us 😉 . That was important to me, too. And the rate of $5 a day didn't hurt either.