I like to imagine Shepard won’t let him on the ship like that so she makes him stand outside while she hoses him down
My Shepard would cover herself in the spilled guts of the slain creature. And then she and Grunt would smack their heads together in celebration of the fact that Grunt took down a fucking Thresher!
She would then share grilled pyjak meat with him.
They would not wash for weeks so that any enemy can smell their bloodlust and tremble in fear of being next!
She is not his owner. She is his battlemaster.