Yarn: Use the colors and size you prefer and the matching crochet hook.
I’ve used crochet hook in 2.5 and the following Schachenmayr Catania yarn:
Soft stuffing
A pair of 6 mm safety eyes (if you choose another yarn, you will perhaps need different eyes)
A needle and some black yarn for embroidering, sewing pins, scissors, stitch marker (optional)

Dimensions: around 6 cm long, 4,5 cm wide
and 8 cm tall.