A vegetarian hot dog is a hot dog produced completely from non-meat products. Unlike traditional home-made meat sausages, the casing is not made of intestine, but of cellulose or other plant-based ingredients. The filling is usually based on some sort of soy protein, wheat gluten, or pea protein. Some may contain egg whites, which would make them unsuitable for a lacto-vegetarian or vegan diet.

Lightlife Foods is a company that produces food for plant-based diets. In 2018, its worth was estimated at $80 million. It is best known for its plant-based veggie dog, Smart Dog, which launched in 1993. In 2019, the company launched a plant-based burger to compete with Impossible Foods and Beyond Meat. Lightlife Foods is a carbon-neutral company.