My 2 year old shih tzu keeps barking at random strangers on the road when he see’s them from inside the car and starts scratching the window. What can i do to stop this behavior?

Hello Siri. Such behaviour is either due to lack of socialization or fear or also territorial insecurity. Distract him from barking at strangers by giving treats or toys or by speaking to him. Never ever yell at him. Use keys words like ‘Quite’ ‘Stop’. But the best solution is training. Consider taking help from professional trainers in kuddle.