Most digestible categories of dog treats ?

Understanding the digestibility of commercially available treats is important to verify their safety for consumption. Maria R. C. de Godoy1 et al(2014) has shared some idea about what are the digestibility levels among dog treats such as : Biscuit, Bones,Chews,Dental treats, Meat Products, Rawhide. Below is the result.

Apparently, Bone is the least digestable treats among all. 

Biscuit, Meat Product and Rawhide showing a great various between gastric phase and intestinal phase.

Chews and Dental treats are generally most digestable treats.