tl;dr: A new study in Proceedings of the Royal Society B tested the classic "bouba/kiki" effect on 70 dogs, using screens and speakers to see where dogs looked when hearing each made-up word. Dogs looked more at rounded shapes when hearing "Bouba" and at spiky shapes when hearing "Kiki," with the effect holding even when owners wore headphones to rule out unintentional cues. Researchers suggest this hints at a cross-species basis for sound-shape associations, though more work is needed.