One dog, Two Dogs, Three Dogs?

Ok, this pup-rescue adventure is prompting this thread.
I've never had more than one dog at once. Last night my friend told me that "two dogs are better than one. But three dogs are worse than one or two, because things start to get political." Interesting!

What is your experience with one dog vs. two? Is two better than one? Two can keep each other company, sure, but if you travel a lot as we do, it would seem much harder to deal with. You can bring one dog to a friend's house, but not two. We were initially just trying to foster and place this little pup, but I think I may already be in love... ;-) Any thoughts or advice?

edit: sorry Kurt, meant to post this in the Lounge. I can't figure out how to move it...