My idea is a whistle that allows you to control dogs with commands similar crono's pet mod. And to be able to make armor for your dogs.
For Example how about a command the makes the dog sit and guard a small area and will attack mobs automatically and return to the spot and sit.
here are some commands
You can ether right click a dog with the whistle to command 1 dog or just make a command for all dogs.
3.guard here(by right clicking the spot after selecting a dog or have all dogs guard the point)
5.return to home (which first must be set or else the dog will run to your spawn point)