It depends on your situation. Just be practical. Consider the fact that most dental schools require you to be in school from 8-5pm with just one hour break. Sometimes you could be in there till 7pm. A dog needs attention and some interaction during the day. If you have someone who is going to be home a lot such as a spouse, friend, kids, or even another pet, than sure get a dog. But in my opinion, if you are not going to have any time to interact with your dog, why get one? Again, the ultimate choice is yours and depends on your situation. Make sure you consider the life of your pet and not just your own.