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I am sorry to hear about what Smokey ate. My name is Rebecca. I am a veterinarian and will do my best to help.
So he got about 27 mg of atenolol per kg (2.2 pounds) body weight; we calculate all drugs in mg per kg. Give me a moment to look that up.
This is a pretty high dose Normally I would recommend inducing vomiting, but after 3 hours it is too late for that. It is not too last to give activate charcoal (not plain charcoal) if you have some or by an emergency vet. He may have his heart rate and blood pressure get too low, so monitoring and treating for low blood pressure is recommended.
She may also have vomiting and lethargy. Good that she seems OK so far, but I might consider the activated charcoal, monitoring to be sure her gums stay pink not pale, and it would not hurt to get her blood pressure checked.
I have not heard back from you! How is she doing? Can I answer any more questions?