Rotterdam

Dog playground in Rotterdam...epa03811039 A dog runs through a tunnel as it enjoys a 'Dog Day' in the first dog playground in Rotterdam, The Netherlands, 02 August 2013. It was expected that this 02 August 2013 would become a real 'Dog Day' as the (so far) hottest day of the year in the Netherlands.  EPA/BAS CZERWINSKI

Bas Czerwinski/EPA

A dog runs through a tunnel at Dog Day, the first playground for dogs in Rotterdam, on Friday, the hottest day of the year so far in the Netherlands