A few of the sims actually have pets already! For instance, Wheeljack has Grimlock, a big, dumb, goofy German Shepard.
Shockwave has a giant fluffy main coon named Predaking (who also tends to be kind of an asshole to anyone besides Shockwave.)
And then there’s Soundwave who has a habit of adopting too many strays. He currently has a rescued street kitty that he named Ravage and an African grey parrot named Lazerbeak that he’s had since college.