[Rex, already something of an id with an elevated body temperature, firepowers, and flame resistant tendencies, so he doesn't seem to notice that anything is amiss at first. Instead, he just growls and pulls the covers over his head.]

Ugh, who let the dogs out?

[He assumes that his idiot counterpart has somehow found a puppy and attempted to adopt it. It seems like the kind of irresponsible, goobery thing Mark would do without thinking.]

Mark!

Juuuust don't let that thing get its stinky pup-juices all over my bed. I don't wanna see any pee on the sheets! Or in my hair-care products! 'Kay? From now on, lil' Yippy over here [that may be a play on Lil Yachty] is your problem.