However, serious non-fatal poisonings have been reported in dogs after eating smaller amounts. Deaths due to theobromine have been documented in horses who ate cocoa bean hulls used in bedding and in other livestock fed cocoa waste products. No chocolate poisonings have been reported in cats, which is probably a reflection of their eating habits. The the first signs of chocolate poisoning are vomiting and diarrhea, increased urination and nausea. These can progress to cardiac arrhythmias and seizures.
Dogs definitely have a sweet tooth.
Dog-proof for home to keep your dog safe. Milk chocolate should never be given to your pet and it should be kept well out of reach. Unsweetened baking chocolate should be kept in closed containers in upper, latched cupboards. If your dog eats potentially dangerous amounts of chocolate and you can get the pet to your vet within two hours, vomiting can be induced to remove the poison. If longer than two hours has passed, the animal may need to be seen and treated.