Dogs can eat asparagus safely as long as it is cooked plainly by boiling or steaming without any added seasonings, oils, or butter. Raw asparagus is not toxic but is tough, hard to chew, and can be a choking hazard or cause digestive upset like gas, diarrhea, or vomiting. The woody ends of asparagus should be trimmed off before giving it to dogs, and the asparagus should be cut into small, bite-sized pieces to reduce risks. Asparagus contains beneficial nutrients such as fiber, vitamins A, C, E, K, B-complex vitamins, potassium, zinc, and iron, making it a healthy, low-calorie treat in moderation. However, it should be given in small amounts and should not make up more than 10% of the dog's daily calories. In summary:

• Plain cooked asparagus is safe and nutritious for dogs.
• Avoid raw, fried, or seasoned asparagus.
• Trim and cut into small pieces to avoid choking.
• Monitor for any digestive reactions when introducing asparagus.
• Do not feed the asparagus fern plant, as it is toxic to dogs.

This guidance comes from multiple recent expert sources on dog nutrition and safety.