Dogs can eat lettuce in moderation, but they must be handled with care and ensure that the lettuce is safe and free of contamination. The water and fiber in lettuce can aid digestion, and it contains vitamins and minerals that are beneficial to dogs. However, there may be pesticide residues or bacteria such as salmonella in lettuce, which can be harmful to dogs.

The lettuce should be washed thoroughly before serving it to your dog. It is best to choose organic lettuce to reduce the risk of pesticides. Additionally, lettuce should be cut into small pieces to avoid choking and fed only as an occasional snack rather than as a main meal. If your dog has digestive issues or other health issues, it's best to consult your veterinarian before introducing any new food to them.