Lexi's been running free since about 4 months and she does just fine. But, free, really means upstairs. When I leave she's downstairs watching me go out the door. But, immediately, whenever she can't find me, she goes upstairs. She can go up , but she can't come down, so she's up there til I get home. But, it works out, because my bedroom is her favorite spot anyway.
Little Mr. Peanut is hilarious, btw...