If you compare that painting with others he made during the same period of time you will see that this is the way he made all his paintings just then.
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It is about dogs and people.
1400s
He painted it in 1968.
Joan Miro used paint (although not sure what kind) maybe acrylic paint ... he painted on canvas or sandpaper (for experimenting) he also used wood for his woodcutting and marble for sculptures.
WHY?!? Because he wanted to.