Our English Springer Spaniel has been bred a few weeks ago, and now we are seeing puzzling behavior. Why does she shiver much of the time, like when she's sleeping, every time she inhales her muscles twitch. Her appetite is down. Her energy is down. She eats the fresh grass every time we let her outside if we don't carefully prevent it, and then she throws up about once per day but it's usually just grass and bile, not food. She's 7yo and in excellent health, a highly trained hunting dog. Does this all seem like normal pregnant behavior?