The Dekofee method cutter set from Bettys Sugar Dreams makes modelling animals a lot easier.

How to use: Roll out your fondant until it is just slightly larger than the cutter. Place the cutter on top of the fondant and apply pressure. Remove the excess fondant and remove the cutter. What remains are pieces of fondant that are just the right size for the belly, legs, arms and head of the animal you are modeling. This way the animal you model is always in proportion.