I have the Sport Dog brand fence and receivers. Fits perfectly. Name of the collar is fitting, since my dog is a Walker Coon Hound/Rotwheiler mix. Looks great against her black and brown coat and conforms around her neck so much better as well. If you have the Sport Dog brand, get a collar parts kit with the angled prong bases, night and day difference of fit because it allows the collar to make a continuous circle instead of a circle for the most part that flattens once it hits the prongs, which in turn is uncomfortable for the dog due to nonconformity around their neck and because of the lack of conformity, doesn't always ensure the prongs are seated snug to the neck to send the corrective shock. Just my 2 cents. Great collar!