Dogs are allowed to eat celery and it is generally safe for them to consume in moderation. Celery can be a healthy, low-calorie treat for dogs as it contains vitamins A, C, and K, fiber, and minerals like potassium and calcium. It also has high water content, which can help keep dogs hydrated, and the crunchy texture may even help clean their teeth and freshen their breath. However, celery should be cut into small, bite-sized pieces to avoid choking hazards, especially for small dogs. It is best to introduce celery gradually into a dog's diet, and it should not replace balanced dog food. Treats, including celery, should make up no more than 10 percent of a dog's daily caloric intake. Dogs with food sensitivities or medical conditions should have celery only after consulting a veterinarian. The leaves of celery are less recommended due to difficulty digesting and potential for stomach upset.