Sweden's geography is built around water: the country has roughly 100,000 lakes, plus a vast archipelago along both the Baltic coast and the shores of Stockholm and Gothenburg, and swimming is a core part of Swedish summer life for people and dogs alike. Allemansrätten generally extends to swimming and launching a small boat from most shorelines, the same access right covered elsewhere in this section for walking and camping.

Away from designated, busier public swimming spots (badplatser), many lakeshores and quieter stretches of archipelago coastline are informally treated as fine for a dog to swim, though a specific municipal beach may post its own signage restricting dogs during the busiest summer swimming weeks — worth a quick look before letting a dog in near a popular bathing spot.

The one genuine caution for any lake swim in July or August is covered in full in the Health section of this guide: toxic cyanobacteria blooms, which can poison a dog that swims in or even just licks dried algae off its fur afterward. It's worth reading that article before a first summer swim, since the risk is real, official, and easy to miss if you're only thinking about the water looking inviting.