What does mr. Preston do for work in the book Shiloh?

Mr. Preston, in the book "Shiloh" by Phyllis Reynolds Naylor, is a farmer. He lives on a farm with his wife, Marty, and their dog, Shiloh. His main occupation is tending to the farm and its livestock.

It's important to note that the story mainly focuses on Marty, the protagonist, and her relationship with Shiloh, a stray dog she finds and tries to keep. Mr. Preston's work is not a central part of the story, but it provides context for their rural setting and lifestyle.