Shotguns and submachine guns are decent in the low levels. The Ray Gun is also effective. However, you should actually avoid the DG-2 (despite it being the "new superweapon") because the hounds move fast enough that you'll miss often. Coupled with the long reload time and low magazine capacity, it is a less-than-ideal choice. The sawn-off, gripped Double-Barreled Shotgun is good if you can reload in the lulls between dogs. The Browning is also good. Use the grace periods between dog rounds to try for these guns.