Years ago, my wife recounted to me a short story that she had read even longer ago which I'm minded of by this sudden new craze for roboVacs.
Essentially - as today - roboVacs were suddenly the must-have household gizmo. Better still, they were ecologically sound, being self powered — digesting the dust, spiders, etc., on which they "fed."
After a while, however, householders noticed that small household pets were disappearing mysteriously — and the denouement was when a mother found one feasting on the face of her baby.
I'm not certain if this was a sub-plot for a fuller story or novel — but it would certainly have made a memorable short. She thinks the story may have been called "Dove" or "Doves", or something (beware, though, unless it was the robots' brand name, "Dove" might just be a complete red-herring — as I've been learning below).
Does anyone remember this story? I would love to dig it out and reread it — perhaps use it to unnerve a friend of mine who is considering buying a roboVac for his flat.
(Incidentally, I did find there is already a true story in the press about an unfortunate Korean lady who fell asleep on her living room floor, waking to find her roboVac busy ingesting her hair: http://www.theregister.co.uk/2015/02/09/robot_vacuum_cleaner_eats_woman/)