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A "simple" question

Posted by Miri Barak on February 13, 2004

the situation: a vet is taking care of an injured cat and he says: If it does not pee by lunch time "I'll have him down and put a catheter in".

Well this "I'll have him down" what exactly does he mean? make him lie down? bring him down from somewhere, or is it some slang?

I'm lost and puzzled my friends.

and thank you of course!!!