Am I responsible for my dog biting someone I do not know in CA?
The answer to this question ultimately is, yes. You are responsible under the strict liability law for anyone your dog bites; it does not matter if the person is a stranger or if the person your dog bites is someone the dog is familiar with, you are not free of liability. And you will be responsible for damages and injuries that were sustained by your dog having bitten someone.
related: California’s strict liability law