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).
In Delaware, dogs are not allowed to run at large unless in situations when the owner is present and has control over the pet. An exception is for farm dogs. Also, during the night dogs must be kept in an enclosure from which they cannot escape, firmly secured with a collar or chain or other device, so they cannot stray from the premises,[3] or are under the reasonable control of the owner or custodian. If an owner does not respect these laws and if the dog bites someone, the owner is subject to civil liability and for fines of up to $1,500.
You want to reinforce behavior you like, such as when your dog looks at but does not react to another dog a good distance away. If you have to stop an incoming assault from an off-leash dog, you can yell “SIT!” at the oncoming dog (sometimes it works) and then throw your meat treat on the ground near that dog and do a quick, calm U-turn and move away. Could the dog have some sort of meat allergy? Possibly. That’s just one more reason the dog’s owner should obey the leash laws.

Cat leashes are used with the purpose of preventing the cat getting lost. Unlike dogs, cats rarely attack persons on the street, so cat leashes are mainly a safety measure to protect the pet itself. Very often the collars are replaced with harnesses, because they avoid the dangers of collars which include escaping and running away or choking. Cats are more likely to not be willing to be walked in a harness than dogs are, and are considered to need up to months to be able to adjust to wearing a harness.

This inexpensive leash is billed as "indestructible," and this pick was a favorite of our consumer (and K9!) testers. Users raved about the reflective material and thickness of the leash, confident that it could hold up to even large dogs' pulling. Testers also loved the look and security of the clip, although it may be a little large for small dogs. 
Leashes are used on large animals—such as bovids, camelids, and equids—to lead them so that they will be forced to follow and come to a desired area—as well as to tether them to a specific area, such as to a fencepost or tree trunk, so that they will remain stationary and not run away. Oftentimes, leashes are used to tether such animals when they require separation, examination, or work to be done to them, such as grooming and tacking up.
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