Animal behaviorists today actually do have a pretty good understanding of the meanings of canine and feline vocalizations and body language. But it's not on the same order of complexity as an actual language, with words and syntax and so forth.
You've done your research good sir

Do you know why Miranda Kadohata was written out of the Star Trek novels? I thought she was an awesome character who presented the struggles of having family not living aboard a starship very well, particularly with the aftermath of the Borg invasion (notably her decision to warn her husband in not so subtle terms to flee their homeworld in case the Collective made it as far as Cestus III).