The National Link Coalition has put together a county-by-county list of where to report animal abuse or neglect, which you can find here.
Remember that you don't have to be certain of abuse or neglect - just suspect that it's occurring. In the state of Oklahoma, animal cruelty laws apply to ALL animals, including wildlife. You can find a full listing of Oklahoma statutes relating to animals here.
"Animals are more than ever a test of our character, of mankind's capacity for empathy and for decent, honorable conduct, and faithful stewardship. We are called to treat them with kindness." Matthew Scully