My dog has diarrhoea whenever her diet changes . She's on James Wellbeloved complete . I find it frustrating that I can't change her food to a cheaper one and she can't have any biscuit treats or bones. She is fine with cheese and eggs but everything else we still have the same problem , diarrhoea and smelly fluffs . We tried today to introduce a cheaper brand and only used half a cup full into her usual food and yet again she's had diarrhoea .