I had that problem with Chloe when she was a young puppy.... I gave her her meals in smaller portions (dinner was 2-3 portions, as soon as she finished one I added the rest), and I added a little bit of warm water to the food, to help her digest it easier. That solved it.
Marley is 8 months now. This happened a few times with him too. A little bit after he ate. He would just gobble the food up and not chew. This was especially the case when he was teething. He didn't chew. It would be full size pieces of his kibble. Vet said eating too fast, should resolve.
Now, if Pup keeps doing it, and/or the amount at one time increases, or you see the orange bile stuff, I would say check in with the Vet. Not to worry yeat at that point, but just to see what they say.
oh i know... he was sitting in front of me when he did it... he looked up at me with thoes sad eyes like he didnt feel good... then ten min later he jumped back up and was playing like a normal puppy again... but i put water in his lunch today and he seemed to acctually slow down and chew it... so hopefully this will work