I don't see blood although the color is not normal. Not black, but a kind of reddish color. But there are carrots in her food.
In the past, withholding food has worked, but she seems to be so messed up these past few days, that she goes right back into problems. In the past week this has been an every 2 day or so problem.
She does seem to be straining. The stool is very soft, borderline diarheea. After the initial there is usually a couple of small spots that are very loose/wet and sometimes little or no color.
I'm going out of town on Thursday and will be gone until Monday. With your suggestion of what might be happening, I think that I should probably get her into to see her vet ASAP, would you agree?