A week late, but this is not what most people seem to think it is. He was not out rustling cattle out of ranchers ranges and keeping or selling them for himself. He's a county judge, not a judge in a civil or criminal court (chief executive of the county, more like an at-large county commissioner with special powers). Specifically, the charges are for violations of procedure set in Chapter 142 of the Texas Agriculture Code, regarding government sale of estray livestock. That chapter lays out certain procedures that have to be followed in different cases like attempts to notify owners, holding public auction, impoundment fees, and the length of time recovered livestock may be held (
https://statutes.capitol.texas.gov/Docs/AG/htm/AG.142.htm).
I know nothing about this case except what is in public news articles. My assumption is that either he was lax in following details of the procedures or documenting how they were followed. But pretty much all of the procedure is a burden on the county sheriff, not the county judge (with a little bit on a judge in a justice court, which could not be presided over by a county judge), so I'm not sure where he'd fit in. Maybe he was working with the sheriff or deputies believing what they were doing was legal. Or it's possible he was intentionally ignoring the law and rounding up stray dogies to sell for himself - but that's a lot of work and not likely to be worth the effort for someone who has a desk job.