The "denta-meter" on the package shows this as being a medium but these chews are most definitely hard. When I first gave my pup this dental chew and she took the first bite, I thought she had broken a tooth it was so loud. As she continued to eat it, it did not soften up and I ended up taking it away from her. This dense of a chew should not be labeled for medium size (20-40 lbs) dogs. Perhaps an extra-large dog like a great dane or mastiff would be ok but Ark Naturals still needs to change the hardiness scale from medium to hard. I DON'T recommend this chew (there are many other brands that are much better).