The cast on Barbaro's right hind leg was changed last week.
"Barbaro is wearing the new cast satisfactorily," said Dr. Dean Richardson, chief of surgery at Penn's New Bolton Center. "We continue to monitor him closely, and depending on how he progresses, we may change it again within the next two weeks."
After Barbaro won this year's Derby, the 3-year-old's racing career ended abruptly when he was injured in the Preakness.
Richardson said Barbaro has a good appetite and seems happy. His owners, Roy and Gretchen Jackson, have said they plan to continue treating Barbaro as long as he seems reasonably comfortable.