Hello and thank you for your question.
What does your dog weigh?
Are you sure it was only one capsule?
I will wait for your reply. Thanks!
Even if your dog ingested the capsule and absorbs the vitamin, she will be fine.
Here is the calculations about the dose she may have ingested.
She weighs 10lbs or 4.5 kg.
The capsule is 1000IU which converts to 25 micrograms. Therefore, she received a dose of 5.55 micrograms per kilogram.
The minimum toxic dose is 37 micrograms per kilogram. So she is not even close to an excessive dose from the one capsule.
I hope that sets your mind at ease. Please let me know if you need anything else. I am here to help.