Having pets in college.. 2 dogs vs. 1?

So I've had my dog for a while, she's a 5 year old bernese mix. She has a rare type of cancer but it's been under control. For the last year while I was at college, a woman I know was babysitting her and she had 2 other dogs there and my dog really began to enjoy their company while the people were away. My predicament is, I know having a dog with cancer costs more and there's a higher risk of losing them sooner, but I've been looking at local rescues and emailing a few to see about large breed mixes they have. She's always loved tumbling and cuddling with other "big dumb mutts" (as my family calls her, lovingly) and although this semester won't be any busier, it will be different because she will be moving here with me into a pet-friendly apartment. They have wood floors, larger hallways, a dog park, dog baths in the laundry room, and even local hiking trails/fields nearby. I've had two dogs at once before but would this be too much for college? I'll have a roommate who loves dogs as well and would be able to help with the walking and attention giving, but since neither of them would be puppies do you guys think this would be ok? Two adult dogs left alone with toys and each other for 4-6 hours a day should be ok, right? I'd be sure to give them adequate walks before and after cl and I am a pre-vet student so although cles are hard, some of them (and my clubs) allow you to bring along pets if they're well mannered. What do you guys think?