Bark frequency and pitch are not random, they follow biological rules
A 2010 study by Hungarian ethologist Péter Pongrácz, published in Animal Cognition, recorded hundreds of dog barks across distinct situations, strangers at the gate, play sessions, isolation, and found that human listeners could correctly identify the emotional context of each bark at rates significantly above chance, even with no prior training in animal behaviour. The barks weren't interchangeable noise. They had structure.
