My 2 year old shitzu occasionally has diarreah with blood droppings. His stool was checked for parasites with negative results. He acts normal, plays, eats, sleeps normally - What could be the problem? the vet recommended changing his diet from all hard food to chicken and rice. The problem went away but occasionally resurfaces. I currently feed him a mix of hard and soft food.
I would eliminate all hard food, and try putting your dog on a grain free or home-made diet. Good choices are Wellness canned grain-free, Orijin canned, grain free, Evo/Inova grain free. California Naturals grain free, and others.
Make sure that your vet tested your dog's stool for Giardia. This is not a routine parasite check. Giardia is difficult to find in the average stool and may require several tests to find the protozoa, but it does cause blood in the stool.
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