I think that John Brunner had this same idea pretty firmly in mind in his 1975 novel Shockwave Rider. Consider the autoporter:
...he nabbed an autoporter and - after consulting the illuminated fee table on its flank - credded the minimum: $35 for an hour's service...
From now until his credit expired the machine would carry his bag in its soft plastic jaws and follow him as faithfully as a well-trained hound, which indeed it resembled, down to the whimper it was programmed to utter at the 55-minute mark, and the howl at 58...
(Read more about Brunner's autoporter)
Scroll down for more stories in the same category. (Story submitted 7/9/2015)
DIY Robot Scorpion Crushes It
'...it raised its front end off the ground and waved its antennae at them, then raised one armoured claw as if to snip them out of the sky.' - Neal Asher, 2008.
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DIY Robot Scorpion Crushes It
'...it raised its front end off the ground and waved its antennae at them, then raised one armoured claw as if to snip them out of the sky.'