context: -LRB- CNN -RRB- -- They 're big , strong , and fierce -- and they wear little blue booties . The police dogs in Duesseldorf , Germany are now patrolling the pavement in protective shoes that their police-officer handlers strap onto their paws . The reason ? Too many glass shards left by beer drinkers in the city center , said Andre Hartwich , a spokesman for police in Duesseldorf . `` We wondered how can we protect our dogs ' feet against glass , '' said Hartwich . `` We looked on the Internet and found these shoes . '' Beer drinkers along the Rhine River and in the city 's Altstadt , or Old Town , often discard beer bottles on pebbled walkways . Broken glass poses a problem for the police force 's 20 German Shepherds and Belgian Shepherds , Hartwich said . In addition , hooligans and vandals leave behind glass shards around New Year 's Eve and during the city 's famous Carnival celebrations . So what 's a dog to do ? Their handlers shelled out 60 euros -- $ 89 -- for shoes that are also worn by dogs who walk on ice in Alaska . Dogs need a month of training to get used to wearing the shoes , Hartwich said . `` We have to condition the dogs to the shoes , '' he said . E-mail to a friend
question: What is the reason for giving them shoes ?
answers: Too many glass shards left by beer drinkers in the city center
content_span_normalized_text: too many glass shards left by beer drinkers in the city center , said andre hartwich , a spokesman for police in duesseldorf .
question_normalized_text: what is the reason for giving them shoes ?
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