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I am sorry to hear this has happened.
How long ago did winston eat the medication?
What medication did Winston eat?
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The dose your dog received will likely cause a short term period of hypotension (low blood pressure). This medication was taken at about 4 times the normal dog dose. There will likely be some upset stomach as well. Because it is 4 times the dose, I would recommend inducing vomiting.
Vomiting can be induced using a teaspoon of hydrogen peroxide orally to induce vomiting. You can repeat again in 10 minutes if there is no vomiting. If he vomits, then you won't need to worry about anything else after that.
The dose is not life threatening, so if you cannot induce vomiting there should not be any severe side effects. He would however need to be well rested for the day due to his blood pressure being low.