It's been my experience, at least in North Texas (where Arlington is - it's the next city south from my town of Euless) that the city Animals Services or Animal Control departments don't utilize volunteers. I'm sure there's many reasons for this. The Euless Animal Control department does utilize teens who are serving community service in lieu of fines for misdemeanors such as breaking curfew, traffice tickets, and petty shoplifting, but last I asked they don't have a volunteer program.