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I am sorry to hear about Thelma's ingestion.
Unfortunately, We do not know the toxic dose of celecoxib (Celebrex) in dogs as this drug is metabolized differently in different individuals. Although this exposure is less than the dose expected for side effects, there is no way to know if your dog is a fast or slow metabolizer and if this will be a toxic dose or not. The best recommendation would be to take her to an emergency facility to give her an injection to make her vomit, activated charcoal to absorb anything that she does not bring up and fluids (IV is ideal but subcutaneous would be better than none) to help flush out her system as well as gastroprotectants (an antacid such as omeprazole (Pepcid), misoprostol, and a coating agent such as sucralfate).
As this drug is a non-steroidal anti-inflammatory, expected side effects would range from GI ulceration to kidney or liver failure.
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