We have 24 civic bathing areas in Gothenburg. Dogs are welcome all year round on 17 of them. The other seven areas are dog friendly from September 15th until April 30th.
Dogs must be kept on leash at all of them, all year round.
Here comes a list with names of dog friendly ones:
Aspholmen (Saltholmen)
Bergsjöbadet
Billdal
Ganlet
Hästevik
Lindås
Marholmen
Nordrevik
Killingsholmen
Delsjöbadet
Smithska udden
Stora Amundön
Stora Mölnesjön
Styrsö Bratten
Styrsö Uttervik
Surtesjön
Tumlehed
The civic ones that are not dog friendly from May 1st until September 15th:
Askimsbadet
Fiskebäcksbadet
Hovåsbadet
Näsetbadet
Lillebybadet
Sillviksbadet
Härlandatjärnbadet
Schipperke-bloggen
I can also recommend Norra långevattnet. There are more private swim spots there where there is no problem bringing your dog :-)
1