One of the above paintings was done by a Brazilian dog named Mambo, and one was done by Andy Warhol:
"In an homage to Andy Warhol’s piss paintings, [Rio de Janeiro-based artist] Eugenio has trained Mambo
to piss on copper-painted canvases every time he said ‘ANDY!’ For three
months, Mambo’s ’studio’ was the backyard of Eugenio’s house, in which
he created three piss paintings a day – one each time Eugenio took him
out for a walk."