"You Don't Know What You've Got 'Til It's Gone" is the forth episode of the sixth season of Private Practice and the 102nd produced episode of the series. It is also the 277th produced episode of the Grey's Anatomy franchise. It was broadcast on October 23, 2012.
A rainy day brings about a hectic night in the E.R and the doctors come together when Cooper's young patient goes missing from the hospital, causing Sheldon to fear the worst about his patient's possible involvement. Elsewhere, Addison and Jake find themselves at odds regarding one of Jake's cases, while Addison inadvertently lands Sam in hot water with his girlfriend when she exposes the truth about their past. Meanwhile, Violet staff must deal with the arrival of James Peterson - the new E.R attending, and Pete's replacement who also butts heads with Amelia.
- "These Days" - Dr. Dog
- "Breaking The Yearlings" - Shearwater
- "Hold Me Now" - Lazlo Bane