It would be nice, if we then could have several pets active at the same time.
Each pet could give a special bonus to the Sims.
Each pet could find different thing such as Sim Cash, Simoleons, Llama Zoom Tickets, and Heirlooms per day.
Several items for pets such as dog basket, litter box, and so on, could be added. But also toys such as balls that are used by the pets could be added.
These items for pets make pets happier, so that they will find more items and the bonus, given to the Sims is increased.