This is such disappointing news. The little gray put in such a tremendous effort in the Belmont Stakes. He deserves to get a victory, he's been pit against so many monsters, he's barely been able to win a thing. The linked article from Thoroughbred Times says he's expected to return to racing in the fall.
I'll believe that when I see it.
Some good news: did you notice that Quality Road worked out on Monday? He worked 3 furlongs at Belmont in 38:83, breezing on a fast track. Let's hope he returns to racing soon and doesn't have any more Big Brown issues.