I agree w what title should be... the whole thing is VERY sad!
However.. He'll get over it.
I raised two black lab mixes together that were brothers, I thought they were joined at the hip.
One (another) day, they got out - and this time only one came back. Never found the other one after looking and posting and searching.
As it turned out, the one that was left became a BETTER behaved dog than he was before - for the rest of his years!
He sort of 'moped' for a couple days.. that was it.
I always have to be reminded that we shouldn't assign human emotions to animals.
It just ain't there.