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Hi, this is Dr. Gabby.
Yes, it is fine to give him grapefruit.
Usually when they eat grass it is because they are nauseous. Or they need fiber.
I do not think a little piece of grapefruit has enough fiber to help his digestion.
So eating the grass may be another issue.
As long as he is still eating well and not vomiting then it is fine for him to eat grass.
So the grapefruit does not have a laxative effect.
Does that help? Do you have any additional questions?