HAHA on your Lab! Yep, I’ve used slow feeders on my older girl too. My Labs try to convince me that I didn’t feed them, fortunately they’ve been trained to never touch anything that falls to the floor. I don’t feed grained food because my almost 11 yo girl gets ear infections with any grains! I’m curious why you think grain free has more carbs than a grained food. When you subtract the protein and fat away from the food, the balance would be carbohydrates (minus moisture and ash).
I do agree with Aquariangt, I used to love The Great Dane Lady but her information seems a bit outdated.
