Swallowing long grass blades whole rather than chewing them can, in rare cases, cause a blockage or become tangled in the stomach. This is more of a risk in dogs that eat large quantities quickly rather than occasional casual grazers.
Dogs can eat grass without throwing up. The grass will often be present in the stool, although it may be difficult to see, depending on the amount ingested. In this way, it is no more abnormal for a dog to not throw up after eating grass as it is for them to do so.

Some dogs may eat grass when they feel nauseous or have mild stomach discomfort. Grass can irritate the stomach lining and sometimes cause vomiting.

This particular example perfectly highlights why Can Dogs Eating Grass Cause A Stomach Blockage is so captivating.
Dogs will eat pretty much anything -- but why grass? First, we should remember dogs aren't exclusively carnivores. They are capable of getting nutrients from different sources, including grass.

Q: Can eating grass cause intestinal blockage in dogs? A: While rare, grass can contribute to intestinal blockages, especially if eaten in large quantities or mixed with other indigestible materials.
A stomach blockage can indeed cause dogs to throw up yellow. This happens when the blockage prevents food from moving through the digestive system properly. Signs that might indicate a blockage include repeated vomiting, stomach pain, and refusal to eat.