I just got the Lansky Crock stick turn box. 2 medium sticks in a cute little wood box (very bushcraft..) and it really works!! As a field sharpener it is superb; the round profile on the sticks also sharpens out notches in the blade so you get a smooth draw cut and a razor edge in moments very easily (assuming you have a sensible edge angle on your dog to start with!). If you are cold and tired and need a better edge in the field it would be hard to beat IMHO..