this is great , Any hints about the workflow to get this kind of infill ?
Sure! Aside from great add-ons available for Grasshopper, it was just a repeatable pattern of lines treated with SubD MultiPipe. This made a big box-type array. The dog was another shape made with SubD. Meshed both and Boolean intersection.
Very nice and unexpected easy rational work flow when you see complex 3D Form like this one