So do pets use skills?

[GM-Ayu]

no, only the custom pets. They loot the moment they are born

Sometimes they are more than laughs and giggles. I use my aliot pet to fight some tough non-undead enemies on my high priest, just because I deal 1000 dmg *per hit* this way while I do nothing but tank (as I can't damage the boss in any other way anyway.) The custom high level pets are quite usable if you can tank while the pet pounds away. Aliot is almost as effective as Lif using mental charge, only that you have to tank.

Also passed wizard job test for laughs without casting a single spell. I just run in circles spamming novi pots while my pet goes out for slaughter XD

There are many creative strategies out there. Sometimes, things that exist "surely only for laughs" may find practical purposes unintented by Gravity or even heRO GMs.