“My Dog Is Aggressive Because He Doesn’t Like Other Dogs When He Is On The Lead!”

Carolyn Menteith is a behaviourist at tails.com with over 25 years of experience working with and training dogs.

With a huge increase in dog ownership over the past 18 months, there are more dogs than ever out and about. Almost anywhere you go, you will sooner or later bump into someone enjoying a walk with their dog – and it is these meetings that give rise to one of the most common behaviour problems.

“Help… my dog is aggressive to other dogs when he is on a lead!”

While owners often perceive this as a problem, in the vast majority of cases, this is just natural dog behaviour, and rather than being a behaviour issue, it is often far more a situation where humans don’t understand how dogs communicate with each other and so put them in situations that can easily give rise to conflict.

Us humans are a verbal species – and a lot of how we interact is via the spoken word. When we meet new people, we get to know each other by talking. That way we can decide if we like them, want to be friends with them – or want to walk away from them very quickly indeed and avoid them in the future! 

When it comes to canine communication however, dogs don’t rely on verbal conversation or their sparkling wit to make friends – but instead they are experts in body language. 

When two dogs meet, the ‘conversation’ may seem very subtle indeed to our human eyes but to the canine couple, these greeting behaviours can be very complex as they discover as much about each other in a few seconds as we ever could hope to do in a chance encounter with another human. 

Using a combination of body language cues, scent, movement and posture, the two dogs will find out each other’s age, sex, health, reproductive status – and intentions. This initial voyage of discovery will involve the dogs approaching and retreating, circling round each other, sniffing bottoms (an olfactory information centre – and also a long way from the toothy end!), and reading each other’s every movement. 

This way they can quickly tell if they are going to be friends or not – and if not, dogs generally have lots of very diplomatic strategies to get out of potentially difficult situations – again by using different body language cues, movements and behaviours.

When dogs are on lead – even a fairly loose one – they are no longer able to show natural communication, and so two dogs meeting might as well be speaking a totally different language. Suddenly what seems to you like a simple social encounter can become threatening as neither dog knows anything about the other, what they are ‘saying’, or what their intentions are. It’s hardly surprising they are uncomfortable, worried or fearful – and show it! 

This behaviour then becomes established as a way for a dog to prevent these difficult social situations or deal with them if they happen. The whole situation is often made worse by the owner shortening the lead, jerking at them, or punishing them in some way which just convinced the dog that meeting other dogs is *not a good thing*!

So rather than assuming your dog is aggressive or reactive on lead, it is probably much more accurate to say that your dog is behaving perfectly normally – and it is up to you to not put them in that situation. And even if your dog is fine on lead with other dogs, you should still follow these tips.

Tips for introducing dogs on the lead:

  1. Don’t!
  2. If you are meeting up with a friend to walk your dogs together, just walk alongside each other to start with so the dogs can get to know each other by watching, getting each other’s scent, even sniffing each other’s wee, and begin to learn about each other without any pressure to interact which can lead to misunderstandings, fear and reactivity.
  3. If they are both totally happy in each other’s company after 10-15 minutes, you might feel confident letting them off the lead together if you are in a safe environment so they can interact naturally
  4. If you meet someone with their dog and want to stop for a chat, suggest walking and talking or else having the dogs sitting quietly some distance apart without eye contact
  5. If you ever do find yourself with two dogs meeting each other face to face on lead (you obviously forgot Tip No 1!), stick to the 3 second rule – and turn them away from each other after three seconds.

Note: If you are worried that your dog might be a danger in any way to other dogs or people, or you are concerned about their behaviour, consult an accredited behaviourist.

12 thoughts on ““My Dog Is Aggressive Because He Doesn’t Like Other Dogs When He Is On The Lead!””

    • That’s really interesting and makes absolute sense. Do you have any information or ideas for a dog that lays down when cars approach and then pounce’s and lunges at them? Luckily we live in a small village so the traffic is quite limited.

  1. This is very helpful and I do find our dog is much happier if I am relaxed and after a few minutes if just chatting to the other owner. She seems to think that’s a sign that all is well. I fortunately she is unpredictable with dogs off lead which causes problems as she is very big (38kg) Newfoundland/OES

  2. Very interesting but since I live in a city where I can see up too 50 dogs on 1 walk it is impossible to turn around at every dog I see. Also my dog is very reactive to just seeing other dogs on leads even if they are relatively far away. He starts to crawl like a tiger about to pounce… Is there anything I can do to help him?

    • It can be harder in a busy area, in this instance we’d advise working with a behaviourist so that they can advise you on the best technique and support that you can provide for your dog in your own environment 💙

    • I don’t know about you but the minute someone says “consult a behaviourist” my first reaction is “I can’t afford that!” and my second is “how do I find one that’s trustworthy?” Maybe you could do a search online to see if there’s an article that might address your problem or find a doggy group forum where other doggy parents might have had a similar problem and can help you! Hope these ideas help. It must be so difficult knowing your dog is going to be like this! We do send signals down the lead so if you’re worried about what your dog is going to do and tense up then the dog picks up on it and starts to react! Try to relax if you can.

  3. My dog sees a dog across the road and starts barking. Even before getting anywhere near? So this doesn’t really explain that.

    • Hi Sab, if you have an specific queries or questions about your dog, we’d always recommend asking a local behaviourist so that they can monitor them in person and advise you accordingly 😊


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