Imagine…
You are a very sociable person. You were raised in a large family. They often had friends round.You love people 🙂

Then as you were beginning to grow up and maybe even reached your teens, you were given away to a family of camels. Yes, camels. An entirely different species. They don’t hug or kiss or chat. They don’t talk to you in any kind of language you can understand – just a load of noises which make no sense to you. They stink too. Worse, they live in the desert, so from that day you don’t see another human being. But you get along OK. You adapt. It’s not a terrible life. Then one day, meandering about in the desert with your new camel family, you see on the horizon not just ONE human being, but a whole bunch of them! You can’t contain yourself. You charge over to them, laughing excitedly and generally making something of an idiot of yourself as you shout ‘HI! HI! OMG! People! Who are you?’ You hug and kiss a couple before they are really aware you are on top of them. But the third one is ready for you – and pushes you away angrily. After all – you are a complete stranger. You not only ignored all the social niceties of a proper greeting – you HUGGED him?? He gets cross. At least the others just move away and put up with your nonsense. But that one who just got angry – he’s not prepared to let it go. He’s a bad tempered old bugger with a dodgy hip; he can’t evade you and it hurts. And you nearly had him over! He gets hold of you and shouts at you to ‘stop!’ Suddenly all your enthusiasm evaporates. You are frightened. You had never met anyone as grumpy as that before and you were only trying to be friendly and you hadn’t seen a fellow human being in ages.
Very quickly your camel family gallops up and intervenes and hurries you away. But mortified by your totally inappropriate behaviour, and angry with the grumpy old man who’d so viciously attacked you, it is clear they are upset as well. They make angry-camel noises at you. All very stressful. No chance for apologies. No making up between you and the humans you were so desperate to make friends with. Everyone is angry and there’s a sour taste of frustration that you hadn’t been able to make friends with any of them and worse, finding out that some people are horrible to you. And you don’t know why. A poor encounter on every level.
So we can easily see how a young dog is being set up to make the kind of mistakes that can end in tears when encounters with other dogs are mismanaged, or allow him to behave in a way that upsets other dogs. But worse than that, if something bad happens, what we humans do in response often compound those worries and fears. Our friend who lives with the camels wasn’t given the opportunity to learn actually most of that group of humans were OK, but, well, if you approach people in a crazy way, they are very likely to going to react badly, especially if they can’t move fast to get out of your way!
Both our human friend and the grumpy old man might get labelled “reactive” in today’s world. The friendly youngster as he jumps up and down with excitement, shouting hello as he charges towards the group of people; the grumpy old man as he reacts sharply, and aggressively, to stop from being hurt or knocked over. Very different motivations; potentially very different outcomes in the long term that might have been avoided had things been managed differently.