My colleague Jane has the cutest dog and he needed a bone to chew! I also put a couple squeakies inside to amuse him. It is made using dishcloth cotton which is a fantastic cheap yarn to use for many projects. A very simple pattern involving single crochet (US) or double crochet (UK) and increasing / decreasing whilst working in rounds. I used some polyester stuffing to pad it out. The pattern can be bought from etsy here.