Hey there! I live in a very small semi-studio with my two dogs and my rabbit, so I feel your pain!!
Though currently I can take my dogs to work with me, once I start school that won't be the case. I will be putting up kennels in my garage for my dogs to stay in during the day.
A walk before you go to work, a walk before you go to class if you have time, may be sufficient. But if you don't think you can do that, hiring an experience dog walker would be a great idea.
"All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another." -Anatole France