Leash Reactivity: It Is Fear, Not a Fight

A dog who lunges, barks and snaps at the end of a leash looks like a dog who wants a fight. Most want the exact opposite. Leash reactivity is usually fear or frustration, not aggression: he has spotted something worrying, he is tied to a rope, he cannot do the sensible thing and leave — so he makes the frightening thing leave instead. And it works. The other dog always walks away eventually, so the behaviour gets rehearsed and paid on every walk.

Distance is the whole toolkit. It is both the medicine and the dose. The number that matters is your dog's threshold: the distance at which he can see the other dog and still eat, still hear you, still breathe normally. Past that line he is not learning, he is only rehearsing. The most reliable gauge is food. A dog who will not take the chicken he would mug you for at home is over threshold, full stop. Back up until he eats.

The game to start today is called “look at that”. Stand where he can see the trigger and still take food — for many dogs that is 30 to 40 m at first, which may mean working from the far corner of the car park. Let him look; do not ask for eye contact, do not tighten the leash. The instant he looks at the other dog, say “yes”, and feed at your side. He looks, you mark, you pay. Ten to fifteen repetitions, then leave before he tips over. Five minutes is a whole session.

You are doing two things at once: teaching him that other dogs predict chicken, and that the sensible move after looking is to turn back to you. Once he turns to you on his own within two seconds of spotting a dog, close the distance — one or two metres per session, not ten.

What you must never do is flood him. Marching him up to another dog to “say hello and get over it”, standing in a busy park until he calms down, letting two leashed dogs “sort it out” — all teach the same lesson: the scary thing gets closer no matter what I do. Flooding does not build tolerance, it builds panic, and panicked dogs bite. For the same reason, do not let anyone sell you a prong or a shock collar. Pairing pain with the sight of another dog teaches your dog that other dogs hurt — the very belief you are trying to undo.

Train an emergency u-turn on an empty street: say “let's go”, turn, jog three steps, pay. Twenty repetitions when nothing is happening, so that it works when something is. Then run your walks like a driver: quiet hours, wide streets, cross the road early, put a parked car between you and the trigger. On a bad day, skip the walk and do scent games in the hallway. A missed walk never hurt a dog; a bad walk can cost you a fortnight.

Bring in help early if there has been any bite, any injury, any redirection onto you or another pet, or if six to eight honest weeks have produced nothing. Look for a qualified, force-free behaviour professional, and ask one question before you book: what will you do when my dog lunges? If the answer involves a correction, keep looking. Book a vet check too — pain from teeth, joints or a sore gut lowers a dog's tolerance for everything, and your vet is the right person to judge whether anything beyond training belongs in the plan.