I mean first off Mason would be doing everything in his power to never ever introduce him. I don’t have the feeling Kavan would earn the “privilege“ of being taken to Masons house.
BUT IF HE DID. And if Kavan got out of the basement and met the boys outside of Masons control….
Clyde would be fascinated by the way he acts and talks. Comply taken aback and intrigued. Rudy would just be terrified of doing something wrong, but also curious because new pet?
Aftermath would include Kavan muzzled for perhaps the rest of time. Honestly he probably would have had to break out of it at the start because mason would have always had him in one.
And because Kavan as now messed with his boys, the kit gloves come off (not that he needed them to begin with.) he’d pull out the electrode implants and attach those, as well as some of the supplements he uses to keep Rudy calm.
And while Mason doesn’t have a dog, I can see him inviting a well trained one over to freak out Kavan and make fun of him. “This is literally a dog, and it follows orders better than you can. Isn’t that pathetic?”
Also if you call them shitty doodles I’m gonna throw water balloons at you. There’s skills and WORK out into those!!! You earned that skill !!!