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Hi there. Thanks for the question. Im sorry to hear your dog Samson got into trouble. Yes I would recommend giving hydrogen peroxide. For such a large dog, try to give him 3-4 tablespoons orally. If this does not produce vomiting in the next 10 minutes, then repeat the dosage.
If the hydrogen peroxide does not produce vomiting or the vomiting does not contain the trail mix then you can do one of the following things:
1. Go to the vet and they have drugs that can induce vomiting.
2. Watch him closely for any signs of kidney problems. The raisins can cause renal failure. Watch for inappetance, vomiting, increased drinking and urination, or depression. Get him to the vet right away.
I hope this helps. Best of luck.