The dog Brandau splashes around during the traditional “Dog Swimming Day”, the season's last day at Opfikon outdoor swimming pool, near Zurich, on September 21, 2025. Since 2020, the Opfikon pool gradually reduces chlorine at the end of the season. By September's Dog Swimming Day the water is almost chlorine-free, making it safe for dogs to swim. Around 800 dogs are expected to attend this year's event. (Photo by Ennio Leanza/AFP Photo)
