It depends on the type of chocolate and the weight of your pet. White chocolate has the least amount of stimulants and dark chocolate has the highest, of which cooking or baking chocolate will cause the most severe symptoms.
A lethal dose of theobromine is 80-200mg per kg, cooking or baking chocolate has 14.1mg per gram of theobromine, dark chocolate has 5.3mg per gram, milk chocolate has 1.4mg per gram, and white chocolate has very little real chocolate in it. If in doubt (and recommended if your pet has eaten chocolate) please contact us so we can evaluate the danger to your pet.
During their studies, researchers have also found that jumbo or large sized boxes often work best. They even suggest trying large plastic storage boxes.
Learn more about spraying and soiling here
Research reported in Neilson JC. The latest scoop on litter. Veterinary Medicine 2009