Roy Wyre, 66, received the fine after walking his dog Spencer in Nottingham last Wednesday. Mr Wyre, a former security guard, was ordered to pay £75 for littering after brushing the animal and leaving some of its fur lying on the ground.
The incident happened in Harvey Hadden playing fields near the city centre on Wednesday afternoon. Mr Wyre, who was wearing a high-visibility uniform at the time, was initially approached on suspicion of impersonating a police officer. He was questioned about his clothing by a community protection officer, who later issued Mr Wyre with a fine for dropping dog fur in a public place.