Aww. the one on the left seems to be saying "please don't leave me!!", whilst the one on the right seems to be saying "well if you really have to, I'll accept it, but it doesn't mean I like it, and you'd bloody well better bring me a present back".
I hear ya... I usually leave Angus with my parents. I work in an animal hospital and we have a boarding facility there, it's pretty safe and everything. But still my dog is not use to cages or be left alone like that. I'm sure your doggies are going to be just fine! Fer