4 ply-yarn uses a 2mm crochet hook
1 or 2 ply-yarn use a 1.25mm crochet hook.

If you only have 4-ply yarn, you can separate the yarn into 2-ply or 1-ply.

The main body of the cat is made with cold colors: white, black, red, and pink.

The hamburger is made with cold colors: light brown, dark brown, green, red, and white.

The eyes are made with a 4mm.