"Sometimes you work like a dog on a car and it's not very fast, " he says.

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"Truth is, Fido doesn't work like a dog's nose does at all, " says Colin Cumming, Nomadics' chief executive.

FORBES

The scientists said the device could work like "an artificial nose for a robot dog", sniffing out extremely low concentrations of vapour.

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Paris employs a huge work force to keep the city clean and its use of golf cart-like vehicles to vacuum dog droppings has received admiring -- and sometimes wry -- attention in the international media.

CNN: We'll always have Paris