https://www.amazon.com/Adams-Tongue-Humans-Made-Language-ebo...

Obviously pets are quite capable of making their wishes known to us, especially if we facilitate it. It's unclear whether they're actually achieving language. I'm tempted to think they are, especially when I see dogs using push buttons to talk to us on Instagram. But I can't be totally sure.

And even if they were, it would be language we taught them. Not independently developed in the wild.