Bless his heart! I am so glad that you rescued him from the elements. What a kind person you are! And how wonderful that the vet neutered him for free! I'm also happy to hear that his paws have improved. Hopefully, he'll have a full recovery.

As for his disposition, hopefully it will improve soon. I agree with Lara when she wrote:
Quote Originally Posted by Emeraldgreen View Post
I wonder if being in a cage is bringing out more fearful behaviour than he would normally show? Maybe a bathroom might help him to feel less scared and would allow for Shirley to socialize him more? But a small room may not be available.
Very often, being in a cage feels very confining to kitties, and their behavior suffers as a result. If an alternative can be found, hopefully things will improve. Let us know how it goes with him. In the meantime, I'll keep my fingers crossed and say a prayer for Frosty.