Description : Lupine's Medium Dog Underground Containment Collars are 3/4" wide. They have two adjustment points to keep the receiver centered on the dog's neck. These collars do not have a D-ring and are not intended for leash-walking. Lupine does not provide any sales or service for the systems. 

The Lupine Invisible Fence Brand® Collar features 2 holes to fit R-22 receivers (hole spacing 1-5/8")