I have 3 dogs, and from what I can tell, they spend their day sleeping on the bed and seem pretty happy about it.
Would they
rather spend the day going for a long hike in the woods, going to the dog park and playing ball for an hour, working on their vocabulary for half an hour, having me set up agility obstacles in the back yard for them, and then feeding them food I cooked myself? I'm sure they would! However, I don't anticipate ever being a stay-at-home-dog-mom, and even the most basic 9-5 job would preclude me from giving them
that kind of lifestyle.
Right now I have a job I love, where I work about 65 hours a week. I walk the dogs for 15 or 20 minutes right before I leave for work, and then for 30-45 minutes when I get home from work, and every weekend I try to take them hiking, or to the beach, or somewhere fun and energy-releasing. When the weather is nice, I try to run each of them for a couple of miles a couple of times a week. Do I think the situation will be different in vet school? To some extent, probably, but not
dramatically different. And I'd love to have more time to spend with them, but they
are a priority to me, and I hope I'm giving them a decent life, and that they're happy.
Especially if you have roommates, I would think you'd be fine. I absolutely agree with the advice not to get a puppy, but a house-trained (or house-trainable over the summer) adult should be fine, as long as you're willing to make the dog a priority. If you can find a place close to school, even better -- I didn't want to live more than 5-6 blocks away, so that I'm close enough to run home and let them out and play with them at lunch sometimes. There are a lot of evenings when I have to leave work to walk the dogs and then go back, weekends when I can't sleep late because they want to go outside, or nights when I want to go out with friends after work but feel bad about leaving the dogs home alone and so I go home and walk them and play with them instead. I guess it's just a matter of how important it is to you to have a dog -- they make me happier than anything else in the world, so anything I have to give up to take care of them seems minor in comparison.
(God that sounds sappy! You should see how cute they are, though)