San Francisco used to be one of my favorite US cities. For variety of reasons, that’s no longer the case. For once the vehicle I drive is frequently a target for bipping (car-breakins) and I can’t risk leaving it on the street. Most pet sits offer free street parking, but that’s where your car is most at risk.
Here is map of the most recent car-breakings and there and as you can see there are a lot, over 30,000 last year, 15,000+ this year.
https://www.sfchronicle.com/projects/sf-car-breakins/
If you are planning on petsitting in San Francisco or Oakland and you are renting a car make sure to never leave anything of value visible inside, even if you are stopping for a 5 minutes coffee or food purchase.
I see everyday reports how tourists lost all their belongings stolen from their rental vehicles. Only about 1% of these breakins are ever solved, so involving the police will not help.