The Dobermans always stay with their breeder. Keira doesn't really enjoy it there (she's beyond overstimulated), but I know they're being taken care of appropriately.
Dance stayed with a chaz member (Zhucca) the first time I went on vacation a couple of years ago, and then this past summer a friend of mine took care of her. She lives with her dogs very similarly to me, and I'm actually pretty sure Dance would trade me in for her haha. She loves her (and her husband) so much. She'll probably always stay with that friend when I go somewhere as long as they're able to take her. If not, I'm not sure where she'd go. She's not the easiest dog to leave always.
I've not taken a vacation since I've had Journey except for the one that I took her with me on. I'd ask my dog friends though (not the one who cares for Dance as that would then be 5 dogs in her house and I'd feel bad) and see if one of them could. Otherwise, I'd honestly probably just opt not to go. I won't leave my dogs in a kennel/daycare/boarding type situation. I would be worried the whole time. I just don't like those situations for leaving my dogs. I wish Journ's breeder was closer, as I wouldn't hesitate to leave her there. But, a 5 hour flight or a several day drive is a tad far.
And if/when I go on a vacation without family, I'd ask my mom to take care of Dance and Journey. She does a great job with them and that would be the most ideal situation for them... but so far, my mom has been along with me on vacations as it's usually family trips we do.