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Hi, this is Dr. Gabby. It sounds like you have it under control.
There are a couple other things you can do.
You can give him a tablet of Pepcid AC or Zantac tonight and again in the morning as the hydrogen peroxide can be hard on the stomach.
If the pieces of metal are small, most likely he will digest and pass them.
Check his gum color now if he is done vomiting. His gum color should be nice and pink. Monitor his gum color a few times throughout the day. If his gums turn pale, and he becomes very letheragic, he could have internal bleeding. But it sounds like he chewed it up well and vomited most of it up.
I would not feed him anything tonight. In the morning you can offer him a bite of the ground beef and rice you made.
Although it does not sound like it will be an issue, keep an eye on him for signs of a gastrointestinal blockage. Signs would include lack of appetite, repeated vomiting, pain on abdominal palpation, and lethargy.
If he has those signs he should see a vet.
Dogs often eat the Vetropolycin and it usually just causes some vomiting or diarrhea.
Does that help? Do you have any additional questions?