I have the rubber caps on Odie's prong collar because he's light-boned and is far more sensitive to the prongs. Tala doesn't need them though. She's a tough little thing. I can't imagine having two 80 pound puppies. :shock: You must have your hands full with them.halo said:The sporn works great for me. mine are over 80 lbs now I had to get the large which was alittle too big so I had to remove some links to make it fit. Thanks for the info. I wasn't sure if the rubber caps did make a difference . they can be removed on them though.