People have been asking us for something long-lasting, something that will "keep their dog busy" when they leave the house, "give them a break while they work from home", and we've heard you~ Introducing, our Bison Marrow Bones! True to our Winnie Lou brand, we are utilizing even more of our local, Colorado Bison with hindshank and femur marrow bones. From the slow-roasted bison on the outside to the rich, delicious marrow on the inside. Our new bison marrow bones will keep dogs occupied and happy for hours! Our bones are available in 2", 4", & 6-8" lengths (perfect for any size pooch!). And there are NO OTHER INGREDIENTS added. No spices, no salt, no rubs, no smoke, no charcoal, nothing harmful or toxic in the way our bones are slow-roasted. We roast them at a very low temperature, slowly over 40 hours ensuring the perfect amount moisture is maintained throughout the process, strengthening the bone, and preventing splintering and breakage. *THIS PRODUCT CANNOT SHIP TO CANADA