@NerdyDogOwner:
Eh..okay, but dogs have a different language than humans….you do know that right?
You might not be aware of it, but when YOU (human) enter a room with strangers, you actually do give off a body language depending on your personality. Aggressive, confident, submissive...etc.
You might be a confident person, and go right in and say "Hello". Others will stand off to the side by themselves. Some will gradually move closer etc. Does not mean one way is (as you put it) the "normal" way.
Dogs have different personality's too. Some are insecure and will roll on their backs instantly, others will run in with confidence and start playing.
It's a shame you see rolling on the back as a bad sign. Something it most definitely is not.
I highly suggest getting the The Language of Dogs DVD.
Er yes I do know that dogs have different body language. Sarah Kaljnas' dvd, 'The Language of Dogs' is excellent and I bought it after listening to her present at the APDTA conference last year. I do not make direct comparisons to dog and human interactions but try to use them as analogies.
But when entering a dog park with 10-20 dogs running about I do not know those dogs individually , so I cannot correctly interpret each of their displays. Nor can I watch multiple dogs, I have to go on overall impression. Which I why I say multiple dogs 'having' (and this is key) to show bellies combined with dogs showing stiff 'dominant' postures causes me concern.
I have never said showing bellies by itself is a bad sign.
I have also added that this is my choice to exercise my dogs daily in off-leash in less densely dog populated areas, so I hardly think I am coming across as neurotic owner who does not let their dogs interact with other dogs, but I try to ensure that anytime my dogs have interactions with other dogs, and that its a positive experience for the dogs we meet as well as my own.
With apologies to OP for taking this thread off topic.