Cow femur dog treat bone.
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We get Max ( my 140 lb Rhodesian Ridgeback) whole ones for Christmas or just because. He will chew the knuckle off the end and start breaking big pieces off. Unreal the power that dog has in his jaws. If he can shatter cow femur imagine what he could do to a human one.
Once the big chunks start coming off Susie throws them out because they splinter. I liberate them from the garbage can and throw them in with my scale material.
They still need a little work but so far so good. I always wondered what FBU scales would look like in bone. I'm not disappointed