To sell an adult pet for profit, you must use a third-party modification (mod) to enable this hidden or restricted interaction. Popular Mods for Selling Adult Pets
In , the base game and Cats & Dogs expansion naturally only allow players to sell puppies and kittens . Adult pets can usually only be put up for adoption, which does not grant any Simoleons. To sell an adult pet for profit, you
: Open the phone, go to the Household/Career (house icon) tab, select Hire a Service , and then Sell Pet . select Hire a Service