Sometimes to convey needs better. Some species of dogs vocalize almost human like sounds. However there has to be selective pressures to encourage DNA change that produces a dog that can talk. Without breeding happening to produce those selective features it will not happen. This probably won't happen for 200K+ years.
However we've been training dogs to press buttons to express their needs and this is likely to come well before AI manages to establish LLMs around dog mannerisms.
