Depends on how much you want to spend really.   If you want to go high end there are things like z-brush and cinema 4D.  There are blender and wings which are free.  Mid end are programs like Hexagon which isn't getting updates and still has some problems with it.  I say start free and if you need more, try demos.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)