Mine do that occasionally, and it's usually because they've gobbled up a small piece of Bully Stick or another (slow digesting) whatever, that they think they'd rather not share. The restriction on the "chewables" sounds like good advice for a day or so. Just go with it's regular food and plenty of water.

I still allow the chewables, but, I make sure that I watch and pick up the smaller (swallowable) pieces, before they have a chance to swallow them whole.

If this last for more than a day or so, you can get some of their regular food, put it in a Blender with some warm water, and make them a "Soup" they can lap up. When it's thin like that, it can be absorbed better, and has a better chance of moving around a temporary restriction. This helps their nutrition while they're processing the item.