God I love this
Gentle dumbification is so cute, it's adorable to see how flustered and worked up it can get a little fucked out pet. Tease and coo at how it really is just an empty headed baby puppy who needs help when it can't do more but a few weak bounces when instructed to ride your cock after getting fucked dumb.
Showing them their body infront a mirror after a good breeding. "Whose that doggy, huh? Whose that pretty breeding puppy there? Awww baby, you really are dumb, that's you silly pup~" as you notice how their little puppy cock starts to throb and they start to hump the air while they stare at their own ruined hole.
Even just instructing the poor thing to change positions mid fuck can prove how cum drunk dumb it's gotten, seeing it squirm all stupidly.
"Awww don't worry pup, I've got you, I know you're just a little dumb doggie, nothing in your pretty head but puppy fluff~" whispered teasingly as you grope their hips and fuck your cum in deeper