These collars have pre-punched, heat-sealed holes to accommodate the receiver posts. Two adjustment points keep the receiver centered on the dog's neck. These collars do not have a D-ring and are not intended for leash-walking.
To determine correct collar size, measure snugly around the middle of the neck, then add an additional 5% for comfort. Lupine does not provide any sales or service for the systems or receivers. However, their Guarantee does include these collars. (Because these patterns are retired you may not get the same pattern as a replacement).
The measurement from the center of the first hole to the center of the second hole is 1-5/8" on Invisible Fence collars. If you're trying to use these collars for a system that is not Invisible Fence Brand please make sure and measure the distance on your current collars to make sure this would fit your receiver.
