If a pet owner suspects or sees their dog, rabbit, or cat eating chocolate, they should act fast. Make sure to recommend that they don't wait to see if the animal develops any signs of toxicity. As we know, consuming chocolate is not fatal for our customer's pets - but it can make them severely ill. The longer they wait to see you (a veterinary professional), can worsen the effects, as well as increase the treatment cost.
The sooner a client visits a veterinary professional from the initial consumption of chocolate, the cheaper & less invasive it typically is. You will also see a better prognosis/outcome if you treat early. If clients wait until their furry friend has already developed clinical signs and is affected by the poison, make sure to educate them that it makes for a much more expensive veterinary visit!
It's good advice to ask that they try to salvage any remains of the wrapper/packaging or find it online and take a picture, and provide their pet's weight. This will help you determine the level of toxicity.