Meet Kim - he's a Newsround viewer who's fed up of seeing dog poo in his local park.
He goes there to play foootball. BUt sometimes gets it stuck to his boots or ball.
New figures for England and Wales suggest the number of people being fined for not picking up their dog's mess, has fallen by almost 20% on the previous year.
In 2011/12 just over 3,800 Fixed Penalty Notices, as they are called, were given out. There were just under 2,900 in 2014/15.
But it depends where you live. Some local councils give out more fines than others.