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The best thing that person can do is let go.
I loved all the animals I had, was never in a position were I had to let it go elsewhere, but, it must be unhealthy to pine after the animal and put a post on here.
Surely by now the most sensible thing would be to replace it? So long as they are now in a stable position to keep the next one for the whole of it's life?
Otherwise just let it go, spending time full of regrets isn't healthy.