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Hi, I'm Dr. Peter. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
Friend, the peach is not toxic. The main concern would be the pit becoming obstructed. But, it is very likely he will pass the pit in the stool without any problem. I would just recommend you observe him for the next day or so. If you notice any diarrhea, vomiting, excessive straining when defecating, etc. have him seen by family veterinarian otherwise he will be fine.
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