Blue is good! It's just some dogs can't handle it, switching back and forth will make him sick also and when they are having a bad reaction you should with hold food for 24 hours, start clean, but if it's an allergy it can take weeks to work it self out he needs something bland that he can go on until his stomach settles then go from there
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I'm just wondering if (which this would be a horrible
thing for anyone to do) he already had health problems and that's why they sold him for only the re-homing fee. Maybe I'm thinking negatively, but lets hope that it's just his diet. Hmm.. What would you suggest for "bland"? Because I've tried white rice/boiled chicken, and sweet potatoes and it hasn't really seemed to help..