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Hello this is Dr. Nobuki. How are you this evening?
As far as information for Selenium overdoses goes, excessive amounts can cause anemia and severe liver damage. I would recommend taking your puppy into a vet tomorrow for at least a CBC/Chemistry 10 to see if any values are altered and then treat them as needed. If everything is normal, I would recommend rechecking the bloodwork again in 1 week to make sure nothing has changed. I hope this answers your question. Please let me know if you have further questions and rate me when you can.