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Hello, I'm Dr. Deb and will do my best to help with this concern about your Yorkie.
In most cases, a double dose of prescribed medication in a dog isn't going to be a problem or cause toxicity issues....and this would be the case here.
You might see sedation in a few hours or possibly vomiting/nausea but this is about all.
He should be fine and I hope this helps to reassure you. Deb
You're most welcome although I'm sorry that I was off my computer when you responded back.
Take care, Deb