I had a toxoplasmosis test a few days ago and both parameters IgG and IgM are negative. As I understand it, that means I am not infected but I am also not immune.
Cats can be critically ill with the disease and test negative.
That's a good practice, even if you're not pregnant. He eventually had to be euthanized due to severe respiratory failure, and toxoplasmosis was discovered during the necropsy. A pregnant dog without food or water will basically sacrifice her own well-being to save her pups, so the pups probably will not be affected. She may not be pregnant at all. The round belly could be from lack of protein, parasites or just a deep chested hunting dog.