First off: I’m so very sorry. I know how much this hurts. I know how much it sucks. My biggest regret was not letting my cat go earlier. I couldn’t be with him when he crashed, and it absolutely destroyed me.
It’s always, ALWAYS better to let them go too early than to make them suffer for our need to keep them with us. We owe them that for all the love they’ve given us.
Self isolation is a big sign. So is the refusal to eat, the general restlessness. It sounds like he’s miserable. I would give him the best day you can, and let him go gently.
Hello,
I’m sorry to hear about your kitten.
There isn’t enough information here for me to offer much advice. But if you think something this severe is going on you absolutely need a vets help.
If this was truly gangrene your kitten would not be able to walk and I suspect they would be liking the legs like crazy.
Your vet needs to examine this kitten to see if this is a skin infection, skin discoloration or deeper problem. Kittens are also incredibly resilient but there is a much better prognosis for your kitten if it is treated as quickly as possible. Too often people wait until a small problem becomes a huge problem. So please go see the vet as soon as possible.
Very best of luck.
Dr magnifico