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Please give me a moment to calculate the exposure dose so I can make appropriate recommendations. How long ago did he eat the rimadyl?
Ok, thank you for your patience. based on the estimate of 5 halves left in the bottle your dog ate about 10mg/kg. In an otherwise healthy dog, we typically think of doses of 20 mg/kg as causing GI ulceration, and doses of 40 mg/kg required to see kidney injury. However, in older or already ill dogs, we can see these things occur at lower doses, especially if he has renal disease.
If he is young and healthy, he will likely be fine and may experience some transient GI discomfort but he shouldn't have any long term effects from a single overdose this size.
Did I manage to address your concerns tonight?