Puppy eats his own poop😳.

So I’ve had my puppy for about 5 months now. He’s trained to go outside to potty and he always does. But lately every time he poops he eats it right after. Like I don’t even have time to clean it up. He just lets it out and then turns around and eats it and it’s soooo disgusting and I don’t know how to get him to stop. Does anyone know of anything?