Dogs are pack / social animals that hate being alone. Some will tolerate it for a few hours, others just get neurotic or depressed. So how would a normal day work? It's only fair to leave a dog alone after it has been exercised. Are you going to walk it before lectures every morning? Then will you be in all evening, or do you plan for it's only human contact to be the hour the dog walker spends with it? Dogs have very little capacity to entertain themselves - a bored / lonely dog will chew.
As for your breed choices, dalmations are neurotic, high energy dogs (they were bred to run alongside horsedrawn coaches) that need a lot of exercise. Rotties are more passive but will chew your house to pieces if left alone too long. Do you have a garden? If not, you are going to have to walk it five or six times a day so it can pee.
Then I presume you plan to work full time after you graduate - what will you do with the dog then?
If you love dogs - please think what you can offer a dog, not what the dog can offer you and don't get one - save it for when you have a house and a family who can share the workload.