It's interesting you bring this up because a few weeks ago, my mate actually growled in his sleep.
Now, he does not identify as 'kin. We have discussed the possibility, and if he is, what that would be (likely a dog). He's prone to calling out and talking in his sleep, but human words and sounds.
So it was really interesting for me to witness him growling, dog-like, in his sleep.
I've often wondered, during a dream shift, if I make wolf or cat noises. Or even if I just make them in my sleep, sans dreams. I make them while awake, consciously and unconsciously, so it would seem likely in my sleep too.
This would be a fun experiment with a smartphone.