No, your dog cannot eat grapefruit. This tart fruit is an acidic citrus that can cause vomiting and diarrhea.
As with other citrus fruits, the PH levels in grapefruit can cause stomach issues in your dog. Too much citric acid can cause irritation, GERD, and diarrhea. In addition, if your dog is on medication, it is especially important to not feed your dog grapefruit.