But more generally I'd ask the question of, if you can train a conscious animal to execute 8 brainfuck instructions (+, -, <, > , etc..), could they also develop a writing system and express higher order languge concepts? Asking why animals don't write assumes they can't, as maybe we just need some kind of intermediate symbolic phoneme concept, as though - like BF for computation, there are some basic unit instuctions that you can combine and parse into anything, and if a border collie can distinguish words for hundreds of different things, I'd wonder if what we're missing is a set of metaphors that represent this underlying core instruction set.
Things like musical notation and knitting stitch patterns are also thought to be Turing complete, so it implies the representation doesn't matter for computation, and computation is sufficient for representing most things, so the idea of finding some underlying instruction set for producing languages across species seems both fantastic yet loosely plausible.