Dogs can eat blackberries safely as long as they are washed and given in moderation. Blackberries are a healthy treat for dogs, rich in vitamins (A, C, E, K), antioxidants, fiber, and low in calories and sugar. These nutrients support immune function, skin health, digestion, and help reduce inflammation. However, blackberries should only make up about 10% or less of a dog's diet to avoid digestive upset, and they should be served plain without added sugar. Wild blackberries should be washed to remove any potential pesticides or contaminants. The recommended serving size varies with the dog's size, ranging from 1-2 berries for small dogs to 6-8 berries for extra-large dogs. Always introduce new foods gradually and monitor for any adverse reactions. In summary, blackberries are safe and beneficial for dogs as a treat when given responsibly in appropriate amounts.