I've had a dog sculpt sitting around that I wanted to test with ZBrush's new zremesher algorithm for automatic retopology. Here is the sculpt and below is a comparison of the different outputs I was able to achieve within about half an hour of tweaking the settings.
I should point out that I only drew the guide curves below with the topology brush and let zremesher do all the rest.
Click for larger image.
Overall, from sculpt through zremeshing, this model took 2-3 hours. The topology needs to be re-adjusted, but overall, I'm loving what zbrush spits out!