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Hello, I'm Dr. Deb and will do my best to help you today.
I'm sorry for this concern for your dog but happy to reassure you that these products aren't toxic when ingested by our pets.
If a sufficient amount were ingested, then vomiting or drooling might be seen usually within 30 minutes to an hour. Some patients will develop diarrhea in 12-24 hours which a bland diet of boiled chicken and rice will resolve within a day or so.
Giving peroxide wasn't a bad thing to do since I know you were worried about toxicity but as you found out, not all dogs will vomit when it's given.
Since you did give it, though, and since he/she might still be a little nauseous, I would probably not feed him/her for a few hours from now.
I hope this helps to reassure you that she/he will be fine. Deb