Keep on training your rescued animals and finding them new homes. Having learned the very basics, you can now begin to work on your own to track down strays that may be in hiding and bring them home. Once a week you need to collect your reimbursed expenses. Once they are ready, you should find them new homes. You should adopt as many strays as you can, train them, love them and keep them healthy. Just now you are learning the basics of what is involved in the rescue and rehabilitation of strays around the neighborhoods. Depending on career level, your sim will gain simoleans on returning from work (reimbursed expenses for rescuing, rehabilitating and rehoming animals! Performance gain has been increased to account for the one hour working week. They will do this autonomously as usual with a rabbithole career, but if for whatever reason they dont, make them attend work or you will not be paid.
Your sim only has to leave for work once a week for an hour.