Bilbao

Frank Gehry's titanium exterior and Jeff Koons's 12-metre flower-covered 'Puppy' West Highland Terrier are fully dog-friendly; the museum interior does not allow pets.

Bilbao's medieval heart — narrow lanes, pintxos bars and arcaded squares where leashed dogs are a natural part of the evening txikiteo bar-hop.

Bilbao's finest central park with an official off-leash zone in the north-western corner, 200 m from the Indautxu tram stop.

The Artxanda Funicular has a dedicated dog compartment (confirmed by Bilbao Tourism) and climbs to open summit parkland with panoramic city views in 3 minutes.

A flat 4-km fully dog-friendly riverside route from the Casco Viejo to the Guggenheim, passing dog-welcoming cafés, the Zubizuri bridge, and the Abandoibarra esplanade.

A hillside park dominated by an iconic industrial chimney, with an off-leash area near the skate park and sweeping Guggenheim views from the upper terraces.