I have an 8 month old golden retriever. She is almost a nice and friendly dog with humans. However, when she meets other dogs, in particular, dogs with the same size or larger, she always submits, laying down and even turning belly up. This happens every time. no exception. This results in that other dogs do not like playing with her. It is a bit embarrassing each time we take her to dog parks.
She does not show any submissive behavior to humans, but rather a bit over excited when seeing strangers, which we are working on and it has gotten better.