Cucumber does not contain some substances that are toxic to dogs, but it is best to feed it in small amounts for the first time, because cucumber contains a lot of water and plant fiber. If dogs eat too much cucumber at one time, it may also lead to vomiting and diarrhea.

Before giving the dog cucumber, the owner should peel it off, because there may be some improper cleaning, some fertilizer or pesticide residues, or some parasites on the skin. Perhaps these will lead to serious gastrointestinal reactions and toxic reactions in dogs.