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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 lab but happy to reassure you that this dose of Ranitidine wouldn't constitute a toxic one for her. While this is obviously a higher dose than would be prescribed for her (about three times her normal dose), I wouldn't expect any significant reactions.
At 1200 mg for a dog this size, diarrhea might be seen. At extremely high doses (over 6000mg), tremors, vomiting and rapid breathing might be seen. Clearly, she didn't receive anywhere close to these dosages.
I would expect her to be just fine. I hope this helps to reassure you about her ingestion of this drug. Deb