Here's why:
* Climate: California's climate is generally mild and wet enough for grazing, making it suitable for raising cattle.
* Land Availability: California has significant agricultural land, which is used for grazing and producing feed for dairy cows.
* Demand: California has a large population, which creates a high demand for dairy products.
While other animals like chickens, pigs, and sheep are also raised in California, the dairy industry is by far the largest in terms of animal population and economic impact.