Indiana is one of the states that has a restraint statute, which means that dogs must be restrained at all times. Otherwise, if the dog bites a person when not restrained the owner is subject to civil liability and criminal penalties. (Cite needed; definition of "restraint" needed; discussion of local Indiana ordinances forbidding dog tethering needed.)
Throw a meat treat in the direction of the oncoming dog, turn on your heels, and walk away. I cannot even count the number of dog owners who are shocked that as their dog is being harassed by the off-leash dog, the owner of stands there, saying nothing, and doesn’t help to put an end to the situation. If another person is walking with you, ask them to attempt to catch the oncoming dog as you leave the scene (you have to decide in an instant if that would be a safe maneuver or not because breaking up a dog fight is an excellent way to get bitten).
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