No, taco is unhealthy for dogs. It is high in sodium and carbohydrates. Some of the classic fillings in tacos are harmful to dogs, such as onions and garlic. Ingesting them may lead dogs to experience toxicosis.
Risks
Tacos contain various ingredients that include onions and garlic, which are toxic to dogs.
The tortilla used in soft tacos is made with lard or shortening, and both are high in fat.
Hard taco shells are high in salt that is unhealthy for dogs.