
I have very similar girl to your boy so I will be following closely what responses you get.
She is 20 months old now so going through that funny hormonal age and finding herself.
She lays down when she sees a dog and waits for the dog to come to her, if they go past without saying hello she jumps and leaps towards them.
It is not aggressive leap but few times now she has also barked/growled while doing the leap and this of course comes across aggressive and also startles the dog(and the owner) and they definately will not come and say hello after that!
It also makes me feel awful as other dog owners do give you very nasty looks like I wanted her to behave like this&I'm a bad dog owner having this large dog that behaves like that (she is totally under control all times& her leap is basically her trying to leap towards them)!
Does anybody actually know why a dog lays down like this, is it "freezing" action as they are not sure or what?
This is how I read it as my girl until few months ago has always been little shy when it comes to other dogs, she likes other dogs but always goes over very carefully and does this laying down and waiting for the other dog to come over, very puppyish behaviour/body language towards other dogs.
However, just like you Winston3 ,recently I have seen more tail up and standing tall behaviour, which I think goes with the age our dogs are.
I know her behaviour partly comes from not being allowed off lead and being on a limited exercise due to an injury and simply having too much energy. When there is this very exciting situation of meeting a dog(she was not allowed to say hello to other dogs for 2 months either) and when the dog doesn't come to her she just "bursts" and loses control of herself. In a situation where there are loads of dogs she is fine, it is just these one to one dog meetings where she can sometimes misbehave. This is only if the dog does not come to her so far she has been fine with every dog she says hello to but just like your boy I'm seeing more dominant signs than before.
I feel little unsure of how she would behave if challenged, this has not yet happened (before she always backed off if another dog growled). We see more or less same dogs on our walks and to all oldies we see and who tell her off she still backs off but I'm not sure she would do this with a strange dog that challenged her.
She is also same as your boy when it comes to treats/toys etc on a walk...
It makes it very difficult to "be interesting" when treats/toys leaping about sqeaking just doesn't do it!
It is easy to say you need to get your dogs attention to yourself but this is very difficult thing to do if they spot the dog as no treat or toy will make my girl forget the dog. "watch me" works brilliantly at home but there is absolutely no point trying it in a situation like this.
My plan is to go to organised "dog walks" where she will get to meet many different dogs not in a training situation(as I know in training/show situation she is fine, my thinking is these walks would be more like everyday on a walk situation but more controlled) maybe also get one to one training as I need to be told how to behave when she doesn't :)! I don't want to make this a problem by reacting in a wrong way and I also want to have outside advise on why she acts like she does...
Very long post to basically say GOOD LUCK with your boy :) :) You are not alone