Archer is a starving doggie he is so starved and desperate his eyes go wide and his mouth starts watering at the mention of his boss' ankles. Also when Giovanni just like waves his hand a little, Archer practically starts shaking cos his brain goes 'PAT??? ME??? A GOOD BOY???' (it's never a pat) please he wants his boss so bad he's doing such a good job please look at him
He is properly taken care of but Archer can't help but be a bit too greedy, even considering he is in Team Rocket. That seems only fitting though, don't you think? :D
He thinks he hides his hunger well when Giovanni crosses his legs and Archer can feel an itch at his teeth when he sees boss' ankles and a tiny bit of calves, or at least he thinks he does (He does, for most of people, and Giovanni isn't one of those hehe)
(Maybe Giovanni will let him have a bite later, as a treat) (Or maybe never)
On that note, Giovanni's line of "I'm expecting great things from you, Archer" from Pokemas is definitely something he uses to push his doggie a bit further uwu "It's never a pat" I feel like you are implying something a bit more sinister and I am enjoying that thought :3