Draw the cat in layers
On 2 mm graph paper, one square for each 2 mm layer, draw the cat at full size from the front and from the side, about fifty squares tall: sitting haunches, front legs, head, and two ears at the top. Draw the face on the side view as one straight upright line from the chin to the brow, so every head layer ends in the same place and the face comes out level. Number the rows from the bottom. For each row, draw a stepped oval made of whole squares, as wide as the front view and as deep as the side view at that row, and cut it out as that layer's template, with a small notch at the front. Where the front legs stand apart in the lower rows, draw them as separate pieces. Layers of the same size share one template. Every step then comes from the grid instead of by eye, and the notches line every layer up to the front so the cat does not twist.