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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. Even though she basically received a double dose of her medication, this wouldn't be considered a toxic dose for her. In fact, 20 mg at one time is a dose which might be prescribed for other diseases/conditions so it's not a terribly high one.
You might notice increased thirst, urination or hunger (commonly seen side effects which can be seen even with prescribed dosages of this drug) but I wouldn't expect any other significant side effects.
I would skip her evening's dose and restart as directed on the label tomorrow.
I hope this helps to reassure you that she'll be fine. Deb
I'm just following up on your dog. I assume she's doing fine but just wanted to confirm that this is the case. Deb