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At this age, he could be having a diabetic reaction to the wound and that might be why it is not healing.
Because of the swelling and the fact that he can't walk on it, you need to see the vet immediately.
At this age, you do not want to take any chances.
Let me know if you still have questions.
No. This is perfectly normal. You have to grieve and to recover and you have to do it in your own way.
Do you know the story of the rainbow bridge? If not, you might find some comfort in in. If you don't know it, let me know and I'll share it with you.
You can find it here:
That same sight has some great tips on dealing with the loss of a pet.
Let me know if I can help more. I know that this is not easy for you.