The Chimeric index is one method of expressing the 'animality' of a character. It consists of several traits [fur, insticts, ears, tail...] each with an assorted number of 'stage points' For example, Jazz has animal ears, with 4 stage points. All the characters characteristics are added together to give a sum total. If a characteristic is subdues, half this value is added. For Jazz this is 34-42. I say 34-42 because, Jazz has as you say, undergone a posture change. Since 'skeletal or posture effects' is a characteristic, the final sum depends of if you're using 94 or 98 Jazz. The total then places the character on the Roe scale. The points required for a value are 10:0, 9:1-2, 8:3-6, 7:1-12; 6:13-20, 5:21-30; 4:31-42; 3:43-56, 2:57-72 and 1: 73-90.

The Roe scale is approximately linear, so with a value of 4, Jazz can be considered 60% animal, 40% humanoid.

Genetic enhancement, they're bred to cause rapid cell regeneration and recovery. More to the point, Why would Devan put carrots and useful weponry right under Jazz's nose?