Solved
No vet employee showed up in the vet clinic.
No employees are appearing at the vet clinic. My game does not have mods. I created a new game to verify, but even the new save file does not have employees showing up.
This is a known bug.
Please upvote & post in the the bug report here: [CD] [GTW] Retail worker/vets don't spawn for business as customer/Can't buy | EA Forums - 5044322
