It’s empty in here!
My dog - a 6 month old Flatcoated Retriever who loves tripe and just about everything else - has no interest at all in these. I don't know why, but there you go... YMMV
A fantastic time killer my dog hates being alone but he loves his Barkoo tripe filled bone more! It takes him hours and it is like watching a cat with cat nip he gets so excited and talks to the bone.