Maybe she is in heat?? her vaginal area is quite swollen, and has a yellow, white discharge. Her stomach is making really loud squirming, crunching noises.when i place my hand on her belly i can feel alot of movement. she doesnt have diarrhea.but some of her droppings are black. Did i change her brand of dog food too fast? is she in heat? or is this something serious?. please help.