[It all builds up in his mind and roils with his anger, makes him bare his teeth and snarl (too much like a dog for his tastes but he has to show Michael how unacceptable this is somehow) and curl in on himself despite the shifting of the plug inside him and the tightness of his stomach.

(maybe he can make it come out, if he moves enough)]

I am not a dog!

[His stomach is still growling but he can bear it, bear it to show his defiance.]