Beach where you can take your dog in Marbella, Málaga, according to official tourism.
«La Playa para Perros El Pinillo en Marbella se encuentra en las afueras de la ciudad.»
With dog fountains and showers (CN-340, km 184). According to the municipal note of 24/06/2017 ('de temporada' (translation: seasonal) areas, open until 15 October that year): dogs under their owner's control, pick up droppings, bathing in front of the dog beach prohibited; potentially dangerous dogs (PPP) enter on a lead via the wooden boardwalk. The current season is not stated.
Source: Official tourism. Rules change every season: check them before you go.