For the next two weeks, thanks to Mustin's care, Dexter slowly regained the use of his legs. That's when he went to recuperate with Diana Dauer, who was also having a rough time of it.
Dauer had recently fallen while riding a horse and suffered a traumatic brain injury - she would recover with bedrest. But, since she was home anyway, she thought she could help Dexter by fostering him.
It was, of course, a foster fail.