Curved dog grooming scissors. Curved grooming scissors also exist in different lengths, ranging from 4 to 10. Although a good groomer can certainly cut any shape with straight scissors, even a curved line or a circle. Most find it easier to use curved shears. The top of the head, the tail of a poodle, or the angulation of a bichon can be cut much easier with 6,5 to 8 curved scissors. The rounder or the more angulation is needed, the more the shear should be bent. That is why ...