Things are going really well. We managed to find a brand of food that he enjoys and he really snarfs it down. He's gained a noticeable amount of weight in just the past week. He's managed to do a complete turn around.
My neighbor did have to take her dog back to the shelter due to some aggressive behavior, and 're homed another cat. She is now down to five cats.
He has turned into a normal and very happy kitty!
This is wonderful news! So glad you remained involved and helped to find a solution so your former kitten can thrive with the neighbor. Sounds like she got hit with a lot on her plate at once, and probably appreciates all of your help!
Thanks for the update! I hope things continue to go well!