Very serious too! My sheltie is addicted to chocolate like a junkie and performed acrobatics last year to get my daughter's easter candy and nearly died. She was seizing and vomiting everywhere for two days and there is no treatment available. It was the most horrible experience waiting it out!
We were lucky and no more chocolate in the house EVER! She will shred wrappers if she finds them and the only time she goes in garbage is if there is a chocolate wrapper in there!