Dogs can be poisoned by coffee beans if they consume too many of them.
Coffee beans are a stimulant because they contain caffeine.
The good news is that if your dog eats only a few coffee beans then they are unlikely to become ill.
I will later use my Golden Retriever as an example.
By using some online calculators I believe she can eat over 200 coffee beans without harming herself.
Additionally although coffee and caffeine are harmful to dogs they are not as dangerous as chocolate- or at least they are not as dangerous as some types of chocolate.