There are a number of champions who can summon pets in League of Legends. When I say pets I mean Malzahar's voidlings, Elise's spiders, Yorick's ghouls, Shaco's clone, etc.
Do these creatures also do increased damage if the champion owns an item with the butcher passive?
Does a champion's traps also do increased damage when they own a butcher passive? Examples would be Shaco's Jack in the Box, Nidalee's bushwhack (assuming it can trigger on monsters), etc.