I've been running a knife only setup for some time now and frequently kill dogs. Unfortunately its not any way near as frequently as they kill me.
the problem I have with them is the combination of the damage they can take, and the teleporting, One stab usually just puts them on the ground and they jump back up and bite me. with the way they teleport around one stab is an accomplishment. i've only managed to pull off a 2 stab kill on one once.
Most of the time though, they arent even where they appear. I take a swing and nothing happens but me getting eaten. Or .... one frame I see his butt 10 feet away, next frame he's eating my face,
I think a single stab, or maybe a couple more bullets would be enough damage for them to take for such a low scorestreak. You can outrun them fairly easily btw. thats my counter to them most of the time anymore. I hear a bark I just keep running.
I agree..the dogs have too much health..If you check out my short video below..I do two head shots with the L115 and it doesn't die..ends up killing me haha..frustrating. COD Ghosts : Guard Dog survives two head shots from L115 | WTF - YouTube