6 month old puppy eating considerably less

I have a 6 month old bouvier puppy, who until about 5.5 months ate normally. Dry kibble, wet kibble, didn’t matter he would eat it. Lately, he’s started eating considerably less, maybe a quarter or half of his breakfast and half or three quarters of his dinner, even with toppers like plain Greek yogurt or canned wet food. He’s in good health, and the vet said his body composition looks good for now. Just wondering if anyone else has experienced this with puppies?? I’m concerned he’s not getting enough calories…