A few thoughts:
I agree with Coolrock in that a single point bite instead of an AoE bite should work better in APB than AR. Other things if dogs remain to OP that can be considered include making the player hold down the mouse button for a second (or fraction of second or however long) with the orange bar at the bottom of the screen before lunging at the enemy. This can be done like planting a flare currently in APB where if you move during the time the flare is not planted, or like the demo truck where you can keep moving, depending on what works better. I think it might also be a good idea to not let dogs inside buildings as I could see how they'd be too good in close quarters. Also the dogs should start barking automatically if a spy gets within a certain radius.
Dogs, cruisers, MiGs: is there anything the APB team cannot do?