* Cowherd: This is the most common term for someone who herds cows.
* Cowboy: While primarily associated with the American West, cowboys also often took care of cattle.
* Cowman: This term is less common, but still refers to a man who works with cows.
* Dairyman: This refers to someone who works in the dairy industry, which often includes taking care of cows.
You could also use a descriptive phrase like:
* Cow-tending boy
* Boy who cared for cows
The best option depends on the context and the tone you want to convey.