Hi Rich,
I have a different viewpoint and experience from anon101. Based on the experiences that I have had, your initial instinct of going with a limited ingredient diet would be the best to start. The Acana you were feeding had lentils, beans, chickpeas and peas. Any one of those ingredients are a candidate to cause poo issues and I would limit as many of those ingredients as possible. My girl that had problems with soft and runny poos when she was a puppy now does fine as long as I stay away from grains and a limited amount of chickpeas–green peas do not bother her. She eats Wellness Simple Turkey or Salmon, and I sometimes add a little Wellness Complete Grain Free, with Honest Kitchen Preference and my own cooked meat as a topper. My other girl that had serious food issues eats mostly Honest Kitchen and a few Wellness kibbles. As you and I both know, Honest Kitchen is not a supplement or a scam.
Although Natural Balance LID diets are lower protein, they truly are limited ingredients with only one protein and one carb source. I use to feed their Kangaroo and Potato formula before it was discontinued. My personal opinion though is to try Wellness Simple first.
