You'll understand why in a bit.
For those of you who like visuals: remember Sophie? The cute little dal-lab that I'm living with this term? The one whose neuron is probably in danger of dying of loneliness? Yes, that one.
See, one of the reasons that she isn't the brightest, despite having some lab, is that her mother died while giving birth. This may have resulted in some brain damage in Sophie. That's not certain, but what we do know is that it resulted in Sophie being bottle fed. (As an aside: the woman who raised her as a puppy lost only one from the litter of nine. Rather impressive.) One (very noticable) side effect of Sophie being bottle fed, is that she doesn't sprawl the way most dogs do. She is quite comfortable lying on her side, or with her legs crossing over each other. If you look you can see how she would have been held as a puppy in her relaxed postures now. She's also comfortable pressing up against people. Quite comfortable doing so. Perhaps more comfortable with it than the people (such as me) are.
I'd show you a picture of Sophie deciding that standing with her forelegs on my lap, hindquarters curled up on the couch, head pushing against mine, was a good way to get attention. Unfortunately, that would have required me being able to get up and get ahold of the camera.