Thank you for your question. My name isXXXXX and I hope I can help answer your questions. I love Karelians by the way.
The amount of the toxic compounds (methylxanthine) to cause mild signs in dogs is 20 mg/kg. That means your girl would have to ingest 300 mg of methylxanthine to elicit mild signs. So a couple of things I need you to do for me.
Look on hot chocolate container and see how much cocoa is in it. And I also need you to estimate how many ounces she drank. Then I can tell you in more detail if you should be concerned or not
Their faces are my favorite part...erect ears and all...very majestic.
Ok...well lets say that he essentially ate one packet of instant cocoa which can contain up to 100 mg of methylxanthines. By that math, your girl would have to eat almost three packets to see the most mild of signs. I think she is gonna be fine. But to be safe, best to watch for any abnormal behavior or signs and get her in to be seen if they develop. These include: increased activity, vomiting, increased heart rate and, at high doses, seizures or tremors.
I am pretty sure you will only see mild signs, if any at all, but keep a close eye on her for the next few hours.
I hope this helps you rest easy
Glad to help out...and no more chocolate