I’d agree with crazy4cats, I think you should try to find a super quality nutrient-dense kibble, then add their favorite meat (cooked or raw, however they like it). Try canned foods, or make your own broth by boiling chicken bones (or just adding some water to any of the juices after cooking the meat). It will add moisture and flavor to the food, two pluses for picky pups.
That’s good that you took away treats. It might help them realize “Oh… This weird stuff in my bowl is actually food? I think I should eat it!” My boy used to be a picky picky eater, he’d go without food for up to 3 days, simply because he didn’t like the brand/flavor. I would quit giving him his daily biscuits, and he’d go back to eating. He wasn’t overweight at all either – as it sounds like your dogs are on the thin side as well.
