Summer's back still shows where she was shaved. Its growing back... slowly. She is REALLY itchy as of late, and I am the only one who can scratch to her satisfaction (according to my wife).
On the other hand... Poor Murphy! Due to the leukemia, the drugs he takes and his age, you can still see where they shaved his belly for the ultasound they did in January 2006. He has a bald spot on his hip from a bone aspirate the Oncologist did months ago. That will most likely never grow back.
Be thankful their fur does grow back.