My black lab is acting strange for the last two days.?

Dog False Pregnancy?

Dog false pregnancy is common if a dog ends heat without breeding. Unlike most mammals, dogs continue to produce progesterone for approximately eighty days after going into heat, whether conception occurs or not. Dogs who experience a false pregnancy may adopt toys, nest and even produce milk. As progesterone levels stabilize, the false pregnancy resolves itself.

She could be coming onto heat or getting into a false pregnancy, especially since they're both acting weird. In the wild, packs of the animals they evolved from woud only let the alpha male and female mate. Problem is the alpha female is the hunter. To remedy the problem, the other females would go through a false pregnancy, then nurse the pups for their mother. Simple enough.

Carries a stuffed animal everywhere: insecurity

Whining all the time: mood swings

digging in a cat box: pretending to look for buried treasure

Pitiful look: again mood swings

She going through puberty or she's pregnant.

she is maybe coming into heat, just keep checking for spots of blood. If not take her to get a check up. Good luck.

Take her to a dog psychologist. She sounds like she has issues.

sounds like she comeing into season ,but with knowing more mmmm ,maybe she lost something