i have a yorkie and when i first got him i lived in a 350 sq. ft studio. he was fine though. i moved the furniture in the room so there was kind of like a dog run from the front door, down the hallway to a chair where i would sit and through his ball back and forth. you will have to move furniture around to get the right traffic patterns. he got a lot of exercise by doing this and i was able to get away with walking him only twice a day. yorkies are great dogs. i highly recommend them. i also highly recommend having 2 dogs though. it changed things completely for me. they are the best of friends and he always has someone to play with when i need to get my school work done. i don’t feel as guilty.