Short answer: a dog who lunges and barks at other dogs on leash is usually having a strong emotional reaction. It is not being bad. Create space and get help.
Dogs Trust says dogs are often described as reactive if they bark, lunge and pull towards other dogs, people or things outside. It says many people think reactive dogs are aggressive but that is not always true. It says reactivity is a heightened emotional response, not naughtiness. It suggests calmly and quietly moving on, because stopping can sometimes make it worse, and notes that a tight leash can tell a dog that a trigger is close.
Keep a distance your dog can cope with. See barking on leash, the reactive dog threshold and a first session.
Dogs Trust has a behavior support line, and your vet can refer you to a qualified behavior professional.
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