I have curved bumpers on all of my saws; no dogs and my saw drops through the hardest of hardwoods. Levering through a log with dogs is a bad habit that increases bar and chain wear. A properly sharpened chain and tuned bar should need no more than the weight of the saw to get them through a cut. No big deal doing it here and there, but if you need to use the dogs to cut then there is something very wrong with your filing or cutting technique. The exception to this can be large face cuts where you don't have the help of gravity.