Question

Why do dogs bark at cars?

Answer 1

INSTINCTS AND LONELINESS: Dogs are very curious in nature and an approaching vehicle perks up their instincts and urge them to chase the vehicles suddenly. So, they end up running behind them. ... Dogs are social creatures and when they feel lonely they just pass their time simply by barking at people or chasing vehicles.

Answer 2

Dogs are territorial.

They often guard their food, their toys, and their bed.

If your dog hears a car approaching its territory, it will likely bark to warn the car off.

As the car passes by, the dog's barking is reinforced.