It takes about two days for a dog to pull out a peach pit after swallowing it. It depends on the actual situation of the dog. You can feed the dog some probiotics to help gastrointestinal motility and expel the peach pit. If it hasn’t come out after two days, it’s best to take your dog to the pet hospital for a check-up to prevent the peach core from getting stuck in the intestines and causing gastrointestinal diseases. If your dog develops vomiting, diarrhea, poor spirits, etc. after swallowing peach pits, he should be sent to the hospital for examination and treatment immediately.