Remember...Before Filling that Hole:
Check with your local State Department of Agriculture or County Agriculture Advisor for information on identifying animal holes and knowing your local protected animals.
Although, the Burrow Blocker is a farm and garden machine that uses only sand and water to fill holes, some states may require a pest control license if you are filling holes for hire.
End users such as ranchers, farmers, homeowners and such, are generally not required to be licensed. Check with your local Agriculture Departments for specific information.