Dogs are extremely susceptible to poisoning by theobromine from chocolate, but only extreme doses complicate humans. Below are the oral LD50s:
LD50 half life
Dog 300 mg/kg 17 hr
Human 1200 mg/kg 2 hr
Given the data, provide a plausible explanation of why the half-life and LD50 are so different for this toxicant (limit 3-4 sentences)