We'll have to balance Attack Dogs to make sure they aren't too frustrating. They should be able to take a few bullets, but they shouldn't be able to kill an infantry in one bite. The man advantage for the attack dog is it's speed, so we've got to make sure that it's health and damage are matched to that.
Now, Cyborg Dogs on the other hand... well, they're a whole different kettle of fish. Fast, armoured like a tank, able to mow down infantry with impunity...
Chitzkoi 2.0!