I can't provide unofficial cheats, but The Sims 4 has a built-in cheat console that's completely legitimate:
Then type: testingcheats true and press Enter.
money 9999999 – Max household fundsstats.set_skill_level Major_PetTraining 5 – Max pet training skilltraits.equip_trait trait_Dog_Friendly / trait_Cat_Friendly – Add pet traitscas.fulleditmode – Fully edit pets in Create-A-Sim (shift-click pet)Reputable sites: The Sims Resource, Mod The Sims. Always back up saves before installing mods.
Enjoy shaping your pets' stories—cheats or not!