Compared to wolves who live in this wood,
my facial expressions are really good.
Domestic dogs have evolved a trait
which helps us to communicate.

Instead of howling long and slow,
like wolves do when the moon’s aglow,
we’ve learnt to bark, say yap, yap, yap
for pay attention human chap.

Our eyebrows we can drop and raise
and give you one big longing gaze
that says now please be nice to me,
you know I love you, honestly.

No wolf can do this clever trick.
They lack the muscles called fast-twitch.
So have you guessed my current mood? 
It’s, take me home and give me food!

Dogs use fast-acting face muscles to help them make puppy-dog eyes:
https://www.newscientist.com/article/2314938-dogs-use-fast-acting-face-muscles-to-help-them-make-puppy-dog-eyes/