My girl is on day 58 of her pregnancy but today her huge pregnant belly has totally changed shape.
She still looks pregnant but is a lot smaller looking. She hasn't really eaten much in today.
Is the shape change due to the pups getting into position to be born?
I can still feel and see them moving about in her.

Does her spine seem more prominent? It could be that she has "dropped" and is now less cylindrical.

Could well be dropping towards the birth position, also I've read that with a bigger litter the ovarian tubes fold under themselves or something like that.