First of all, getting a dog when you're renting a room is a bad idea. Not fair to the dog at all.

Buying from a pet store, well that's a whole other thread entirely. MOST pet stores buy from puppy mills. Puppies from mills are sick and often come with a host of illnesses you don't know about till the dog gets sick. Besides, why BUY a dog when you can adopt one that is going to death row.

Please reconsider your idea. Keeping a dog in a ROOM is just not right. Dogs, regardless of what SIZE the dog, need room to run.