Soft stool can also be cyclical because if the stool isn’t hard enough to help properly empty the glands, it can contribute to soft stool again. But I think your vet would have noticed that. This is part of the reason our vet recommended a probiotic for Sundance. I did recently learn that dogs with food allergies can be more prone to “overactive” anal glands, and this is consistent with my experience with Sundance in retrospect. He needed his glands emptied occasionally as a puppy but once the food issues were resolved he didn’t need them emptied anymore. If the vet is confident it’s a food issue and you’ve already changed food, I’d consider allergy testing or whatever the vet recommends to determine the specific food involved. Our vet was going to start Sundance on an elimination diet but we decided to switch to one more food (I’d already purchased it and we picked it because it was close in ingredients to what the breeder fed). We got lucky and the issue resolved, but I still don’t know the culprit ingredient. If I need to change food in the future I wouldn’t dare do it without knowing specifically what food to avoid. Sundance does not like messes and he was just as miserable with soft poop as we were cleaning it up. He also did not do well on grain, and if there was a reason to choose a diet with grain I’d definitely want to know specifically which grains to avoid and which work for him.
Sundance did well on Fromm but his poop is a little bulkier on Stella and Chewy. I prefer this because I’m paranoid about the gland issue, even though my vet said it wasnt the kind of gland issue that would be an ongoing problem requiring manual emptying on a regular basis. The probiotic Sundance takes also seems to make his poop a bit bulkier and it seems better processed, for lack of a better word.
It still makes me laugh how normal it becomes to discuss dog poop in such great detail!