We had this problem for ages and then switched to Chappie tinned food, high in fiber. If he does ever get a flare up, I give him probiotics and smaller portions fed three times a day.
Your dog may have a bacteria and I would suggest asking the vet to do tests on his stools. Maybe the Giardia is back or never went completely. Did they test after the treatment to see if the Giardia had gone?
Chicken and rice didn't help us and gave Dylan constipation, not enough fiber.
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