Raven was this way a lot and still is to a degree. When I'd take her to the dog park she'd run up excited to another dog but as soon as they turned to her she'd skitter away and roll onto her back. In tag games she'd love to chase another dog but if they turned to chase her she got a panicked look on her face and would throw herself on the ground with tail tucked. She did this even a couple years ago when my parents got a smooth collie and we took them all out to play in a field.
Once she gets to know the other dogs, she eases up, but she's always on the cautious side. She's never shown any hint of aggression. She's just a very submissive pup. However, she does seem to be happiest playing with other submissive dogs. She's just not ever really at ease around a dominant dog.
Oh and one other thing I noticed, some other more dominant/pushy dogs seemed to pick up on her nervousness/submission and would start to try to bully her. In that situation I just removed her from those dogs asap.
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