The Danish parliament passed a resolution that requires all dogs to be painted with a 15cm (6 inch) wide version of the Danish flag, the Dannebrog. The goal is to improve road safety by making dogs more visible at night. Denmark reported 7,000 road casualties in 2007.
The legislation came into effect on April 1st, 2010, but dog owners have three months to mark their pets. The color used is a special version of animal-friendly red and white coloring with high night visibility.
The resolution actually goes back to a 1965 proposal brought forward in the Danish parliament, which was rejected at that time. This time, the resolution was proposed by the Danish Green party, De Grønne.