Got to agree with all the above I found that at around 10 to 12 months they go from eating everything as a pup to slowing down. Our girls have one meal a day at times they go through periods of having two but they let me know if they get too much then they just refuse to eat its not the food it's just they don't want anymore
I agree stick with one food and remove if not eaten then put it down again later they won't starve