OK, so the stool is still formed, but mucusy, right?
I would think that it could be a food intolerance. Whether to the rice, lamb, or some other ingredient. I would eliminate the new food you were beginning to introduce and see if things clear up on their own. Compare the ingredients in what he’s been eating to what you were beginning to introduce.
I’m still working on an elimination diet of sorts with my Golden with food intolerance issues. Any time he has a reaction to something, I eliminate the new food/supplement and go back to the base diet so things can resolve. Only then, do I know for sure what the offending ingredients were. Problem ingredients can be obvious like, lamb or rice, or more obscure, like flax or garlic. So compare every ingredient. Sometimes a reaction takes a little while and sometimes, it’s immediate. So almost anything he’s eating could be suspect. Because my dog has so many intolerances and I’m a rotator, it’s important to me to have several foods that I know he’s good with to use as a barometer.
