Gus is again having issues of rectal bleeding

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One or two of you might recall my discussion of buying clearance priced Pet Pride canned dog food and Gus having rectal bleeding and bloody stools. When I changed back to Purina One, it stopped. But not before I'd spent a couple hundred dollars on tests that came back negative for everything. Recently, I learned of the disgusting ingredient, "animal digest" which is ground up Humane Society euthanized animals and other animals. So when I saw Pet Pride's brand of Kibbles 'n Bits--which Gus loves--I bought it. Again, he had blood in his stool and rectal bleeding. He's on Purina One again, for the past four days. It's not as bad as before but still there. I guess it will take a little more time for whatever it is to be out of his system. Have any of you had anything like this happen with any dog food? It may be the breed? Gus is a Boston Terrier. Cookie, my rat terrier, has no such symptoms with the food. I hate feeding my dog food with "animal digest" but I can't afford the premium foods that don't have it. Any cheap recipes for homemade dog food that will fill a doggie up without breaking the bank?