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.
The Oklahoma Link Coalition promotes collaboration, cooperation, public awareness, and education to end violence against people and animals by recognizing the link between human and animal abuse. The Coalition is a project of the Kirkpatrick Foundation under its Safe & Humane initiative.