I know if it were me there would be no way I could leave my dogs behind, but I do understand your dilemma.

You're afraid of the changes they might have to endure moving? The dogs will adjust just like the rest of you will. They'll adjust to no grass or trees, and get used to being in the house. I also thought about the same thing as Erika, would the renters mind free-roaming dogs? My vote goes for taking them with you...but I'd support you either way.