My sister's toy poodle at about a third of an Orange Lindor

Take it to the vet/animal hospital

Call the vet and see what they say. It was a small portion, but it's also a small dog and dark chocolate.

>allows her dog to consume chocolate
>is a BYB

If it survives tell your sister to give the dog to a shelter so someone responsible can take care of it.

>>2019254
Because accidents never happen, amirite?!
Get over yourself. Not OP here but just a normal person without a high horse.

>>2019463
leaving chocolate where a dog can get it isn't really an accident

My cavalier stole a whole chocolate orange once and he just shat weird for the rest of the day. Little bastard.

>>2019470
I just got back from walking my 3 Blenheim cavaliers.

>>2019483
Having 3 cavaliers sounds amazing, they're brilliant dogs. I miss mine. :(

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>>2019493
3 nuggets in a bed

>>2019468
Dogs can get extremely creative when it comes to delicious human food.

OP, I'd give the vet a call, or take her in the morning. She will most likely be fine, but better safe than sorry and all that.