My one year old cat has been have trouble with his bowels. He poops daily in the proper place, but little "poop nuggets" literally fall out of his butt when he runs or jumps (anywhere from one to five times per day). This is not poop that is stuck to his fur. This is fresh poop. These are not intentional and he often does not even notice he has done it. They, thankfully, are easy to clean up because they are not too soft. He eats high fiber cat food and does not have any parasites. Occasionally, there is blood at the end of his intentional stools (like a gooey sac of blood about the size of a nickel). I am worried about him. I have taken him to two vets and they have not given any helpful answers (changing the food did not help). Any thoughts would be appreciated .