Max and Harley have a male dominance thing going on so I pull out a spray bottle of water to give them a blast in their face to end the fighting. Harley will run away at the sight of the bottle, and Max will run to the bottle to lick the water from it. It does the trick so I can't complain.

Pros: controlls fighting in dogs

Cons: none

Some ferrets probably like to play in water, they may even enjoy being sprayed- but my ferret would be craftily plotting my death in her ferret hammock if I dared to spray her with a spray bottle...not a good idea if you want to stay alive.

Pros: none

Cons: not a good method for training