My previous lab had chronically loose stools. One day, he caught a mouse, swallowed it (probably whole) and his stools firmed up.
I considered whether to get some feeder mice and introduce them as a regular part of his diet.
My daughter has lost track of the mice that Zeke, her miniature schnauzer, has killed - along with a red squirrel and a couple of rabbits. (The rabbits were not a lot smaller than he is.)