My dog runs off as soon as I approach what is in its mouth: how do I fix it?

It is the sign that in the past your approach has meant losing the object, so it has learned to defend it by running. The fix is to reverse the association: stop chasing and snatching, and start approaching only to offer a better trade, often giving the object back when it is not dangerous. Over weeks of favourable trades the dog learns that your hand brings something good, not a loss, and stops fleeing.

Do I always have to give a treat, or do I stop at some point?

The reward stays part of the system even after the command is learned, because it is what keeps it reliable over time. With practice you can move from rewarding every time to rewarding less predictably, but it is unwise to remove the reward entirely, especially for leave it in hard situations. A command that protects from danger is worth more than a few treats, and keeping the trade valuable stops the dog ceasing to respond.

Can I prise its mouth open to remove the object if I am in a hurry?

It is better avoided unless it is a real emergency, because forcing the mouth teaches the dog to defend and can make it swallow quickly what it has. The best route stays the trade: offer a high value treat or scatter several treats on the floor to draw it off the object without conflict. Only if it has something dangerous and there is no alternative do you step in, calmly, keeping in mind that safety is the priority and the vet should be contacted at once.

From what age can I start teaching leave it?

You can start early, from puppyhood, with low value objects and very short, playful sessions. In fact starting early and always positively prevents resource guarding, because the puppy learns from the outset that the approaching hand brings something good. With an adult dog that has already learned to defend, the path is longer but works on the same principles, and in difficult cases it is worth working with a behaviour professional.

Training step by step15 minLevel: BeginnerUpdated on August 6, 2026

Teach your dog leave it and a happy trade

How to teach a dog to leave an object and to drop what is in its mouth, using a trade, a difficulty progression, and never chasing or punishing.

Audience: Pet owners
Species: Dog
Scope: Valid everywhere

What you need before you start

Premietti piccoli e molto appetibili, di due livelli di valore, da usare come ricompensa e come scambio
Un oggetto poco interessante per iniziare, in un ambiente tranquillo e senza distrazioni
Sessioni brevi di pochi minuti, con il cane non affamato ma nemmeno appena sazio
La disponibilità a non punire e a non inseguire mai il cane quando ha qualcosa in bocca

The command that most often prevents a serious problem is not sit but leave it. A dog that releases what is in its mouth at the first cue, or that gives up picking something off the ground, is protected from many daily dangers: poisoned bait, bones that splinter, dropped medicines, foreign bodies it might swallow. Yet it is also one of the worst taught commands, because the instinct of the person teaching it is the wrong one: chase the dog, prise its mouth open, tell it off. All of that teaches the dog exactly the opposite, that when a hand approaches the object is about to be taken away, so it is better to run or to defend it. The approach that works is the reverse and rests on a simple principle: letting go must always pay. This guide covers the difference between not taking and dropping, how to build the trade step by step, how to raise the difficulty, and how to react when the dog already has something dangerous in its mouth.

Why leave it protects the dog

A dog explores the world with its mouth, and at home and on the street it constantly meets things it should not pick up. A solid leave it turns a moment of risk into a routine gesture: the dog hears the cue, moves away from the object and receives something better. That exchange of value is the heart of it. If letting go means losing something and gaining nothing, the dog learns to defend what it finds. If letting go always leads to something good, the dog learns to release willingly.

The difference between not taking and dropping

These are two distinct behaviours worth teaching separately. The first is giving up taking something the dog does not yet have in its mouth, for example a morsel on the floor or an object on a side table. The second is releasing something it has already grabbed. Many people confuse them and use one word for both, but the dog experiences them differently: giving up what it does not hold is easier, releasing what it possesses is harder and involves the urge to protect.

For clarity it helps to assign two different cues, for example one word for not taking and one for dropping, and to teach them at separate times. In both cases the mechanism is the same: the right behaviour is always followed by a reward worth more than the object given up. With practice the dog responds to the cue alone, but the reward stays part of the system afterwards too, because it is what keeps the command reliable over time.

Teaching the trade step by step

Start with a low interest object
In a quiet setting, give the dog a low value object it holds happily but without attachment. Do not start with what it defends most, or the first experience becomes a conflict.
Offer a better trade
Present a high value treat near the nose, without snatching the object. The moment the dog opens its mouth to take the treat, calmly say the drop cue.
Reward and give back when you can
Give the treat and, if the object is not dangerous, hand it back. Returning teaches the dog that letting go does not mean losing for ever, and reduces the urge to defend.
Repeat until the gesture flows
Do a few repetitions per session, always positive. When the dog releases easily, start saying the cue an instant before showing the treat, so the word comes before the gesture.
Introduce not taking from the floor
Put a low interest treat under your hand or foot, say your not taking cue, and reward from the other hand when the dog gives up and looks at you. The object on the floor is never the reward.
Add the lead for real trials
When you take the exercise outdoors, keep the dog on a lead so you can manage it safely without pulling or jerking, and keep rewarding every give up with something better.
Make the command a habit, not an emergency
Practise leave it often in easy situations, not only when it really matters. A command trained every day responds in the critical moment too, while one used only in panic fails.

Raising the difficulty gradually

A leave it that works in the living room with a toy does not yet work at the park with a morsel: the dog has to learn to respond as the value of the object, the distractions and the distance all rise. The progression should be made one element at a time, stepping back if the dog fails rather than insisting on the same level.

Difficulty progression for leave it
Variable	Where to start	Where to reach
Value of the object	Low interest object	Very tempting object or morsel
Environment	Quiet, familiar room	Street, park, other dogs present
Distractions	None, silence	Noises, people, movement around
Distance from the object	Object close and controlled	Object on the floor a few steps away
Your role	Treat shown at once	Cue only, treat after the response

The practical rule is to raise only one variable at a time. If you increase the object's value, the distractions and the distance together, you ask the dog too much at once and set it up to fail. When a level is solid, go up by one only; if the dog does not respond, go back to the previous level and consolidate it.

Common mistakes and what to do in an emergency

Chasing or snatching the object from the mouth: it teaches the dog to run or defend, and encourages resource guarding.
Telling off after it has let go: it links your approach to something negative and makes the dog less willing to release.
Always using the same treat against a high value object: if the trade does not pay, the dog does not let go.
Never giving anything back: if letting go always means losing, the dog learns to hold and defend.
Trying the command for the first time in an emergency: a leave it never trained does not respond when it matters.

Frequently asked questions

My dog runs off as soon as I approach what is in its mouth: how do I fix it?: It is the sign that in the past your approach has meant losing the object, so it has learned to defend it by running. The fix is to reverse the association: stop chasing and snatching, and start approaching only to offer a better trade, often giving the object back when it is not dangerous. Over weeks of favourable trades the dog learns that your hand brings something good, not a loss, and stops fleeing.
Do I always have to give a treat, or do I stop at some point?: The reward stays part of the system even after the command is learned, because it is what keeps it reliable over time. With practice you can move from rewarding every time to rewarding less predictably, but it is unwise to remove the reward entirely, especially for leave it in hard situations. A command that protects from danger is worth more than a few treats, and keeping the trade valuable stops the dog ceasing to respond.
Can I prise its mouth open to remove the object if I am in a hurry?: It is better avoided unless it is a real emergency, because forcing the mouth teaches the dog to defend and can make it swallow quickly what it has. The best route stays the trade: offer a high value treat or scatter several treats on the floor to draw it off the object without conflict. Only if it has something dangerous and there is no alternative do you step in, calmly, keeping in mind that safety is the priority and the vet should be contacted at once.
From what age can I start teaching leave it?: You can start early, from puppyhood, with low value objects and very short, playful sessions. In fact starting early and always positively prevents resource guarding, because the puppy learns from the outset that the approaching hand brings something good. With an adult dog that has already learned to defend, the path is longer but works on the same principles, and in difficult cases it is worth working with a behaviour professional.

What to do next

Teach not taking and dropping separately, starting from low value objects in a quiet setting and always offering a trade worth more than the object. Give back what is not dangerous, raise only one difficulty at a time, and train leave it every day in easy situations, not only in an emergency. Never chase or snatch, and if the dog has something dangerous in its mouth offer a high value trade and contact the vet at once.