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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years and I'd like to help with your question.
Peroxide induces vomiting my direct irritation of the stomach. Usually once they vomit up the peroxide the vomiting subsides quickly. Did you give more than one dose? All you can do at this point is try to soothe stomach lining. The pepto was an okay choice. You could also give a single dose of Pepcid A/C (famotadine 10mg). You should also give him small amounts of water at a time. Try 1/4 cup every 30 minutes to every hour. If he holds down the water for 4 hours then you can give some bland food. I like white rice and cottage cheese. It is easy to digest and easy on the stomach.
If he can't hold down even small amounts of water then I would worry that he could become dehydrated and it would be best to seek out emergency care. They can give him injectable antivomiting medication.
I hope that helps, but if you have additional questions please let me know. If not, please rate my answer.
I think the problem was that the peroxide sat so long... if they vomit it right away it doesn't have much chance to irritate the stomach, but sitting for 90 minutes was irritating. Try a small amount of cottage cheese if you have it. and try the pepcid. But 5 hours is a long time to still be feeling bad. If it is an option you might consider taking him to a veterinarian as soon as you can. He might feel a lot better if he gets some injectable antinausa meds and some sucralfate. The sucralfate is what we use to treat stomach ulcers and I think it would help in this case.