Lupine universal underground fence collar with three heat-sealed holes to fit all Invisible Fence Brand® receiver models as well as Pet Stop®, Pet Safe® and Dog Guard® systems and will work with hole spacing of 1 1/4" or 1 5/8" and has a hole diameter of 5/16". 

Note: If you have a system that it is not listed above, the 3-hole version for Invisible Fence Brand®, Pet Stop®, Pet Safe® and Dog Guard® receivers may fit your system. Due to the number of brands and models, we do not have a complete list of compatible systems. 

These collars do not have a D-ring and are not intended for leash-walking.