You don’t actually have to play with him. You can just taunt him.
Take the skull, toss it next to you, away from him, and pick it back up. Move away in the cooldown timer, and repeat. If someone summoned Karaage, tap and slap for credit, after you pet Deathfang of course.
Sound cruel? Well, welcome to hell, buddy.
You’re a mean dwarf!
Dang, that’s savage, lol. Makes sense but admittedly I rather like playing with the big puppy. 
Why would you not want to play with the dog?
It’s faster.
I do not understand the difference. You throw the skull wherever you wish and he either brings it in his mouth to you or he automatically gives it back. Why does it need dropped next to you?
But busier. It’s like make-work.
Deathfang is adorable I wish I could play fetch with him all day.
It’s far faster to retrieve. You can do it frame-perfectly, as you know where and when it will be. No trying to figure if it’ll be on the ground, in his mouth, or in your bag.
Because I’ve got shtuff to do.
I’m sure the whole minute I saved while wasting time in a video game will come in handy some day…
Here, play with him all day then.
I’m not made of stone. I mean, anymore.
Don’t mess with Deathfang! He’ll bite your head off, man, and that will be his new toy!
Naa, I like playing with the doggy.
Possibly a few seconds, perhaps. That astounds me that those few seconds are somehow so precious to some. But to each their own!
Probably more like 12 seconds. 
Maldraxxus is not hell, everyone knows that Bastion is the true hell of the Shadowlands.
thats just mean lol
Why be so mean to the goodest boy
I don’t make the rules but he clearly did something to end up in Maldraxxus.
Anyway, you can do this if you want. You can also play with him infinitely, that’s why I developed that strat (a post which has a lot LESS traction, I might add.)