As tempting as it may be, DON'T DO IT!!!! Nursing school is going to be very demanding and dogs require a lot of time & work (even if they are house trained). You are going to spend most of your time in class, clinic & studying. It would be unfair to the dog to be left alone during all that time. It's like having a kid except you are legally able to crate them when you leave without getting in trouble.
You will also need to think of the added expense of dog food, tick & flea medication, and heartworm medication. And that's just if the dog is healthy. My dog is a rescue and we later discovered she had pancreatic issues and food allergies. Long story short, you do not need the added responsibility of a dog, trust me! Wait until you finish school.