Hi Kristen-
I spent about a year and a half doing what you are doing right now, with my pitbull. I was switching foods constantly, looking for the lowest carb foods, no potatoes for a while, no grains, high protein. It did absolutely nothing to help him because I had been given very wrong information about why and how yeast forms.
Yeast naturally grows on the dogs skin and when their immune system is healthy, the body regulates the yeast and keeps it under control. The opposite happens when the immune system is weakened, often times because of allergies, but other reasons as well. Though many people will continue to perpetuate the myth that carbs “feed” yeast because they break down into glucose, this is untrue and therefore simply limiting carbs without having an understanding of what is causing the immune system to be suppressed is pointless.
If you believe food is an issue, you will need to conduct a proper elimination diet, which it sounds like you may have attempted at one point though I don’t know what food you used to attempt it. When doing one properly, you will either need to homecook one novel protein and one novel carb for 2 months straight or use the veterinary theraputic diets whos proteins have been hydrolyzed. Hydrolyzation of the proteins breaks them down into their component amino acids making the immune system unable to detect them, thus not causing an immune system response. During this time they of course can not have anything but that diet. No treats, no flavored meds, nothing. An elimination diet is the golden standard for diagnosing food allergies. Those who have told you allergy tests for food allergies are unreliable were correct, they are. Often times yielding false negatives and false positives.
I personally chose the veterinary theraputic diet to do my pitbulls elimination diet (Royal Canin Hydrolyzed Protein) and he greatly improved, thus telling me food was a component to his allergy issues. He is now eating a fish based, grain inclusive food with almost 50% carbs and is yeast free during the winter months. Unfortunetly when June hits in the south here he does get a little worse again leading me to suspect environmental allergies on top of the food issues. But for that I bathe twice a week in Malaseb shampoo to kill the yeast. I’ve been successful with this regime for 8 months now.
