Chocolate is processed from cocoa beans and contains a variety of methyl xanthine derivatives, including caffeine and theobromine. Theobromine in chocolate will act on the central nervous system and heart muscle of the dog, thus poisoning the dog. Both humans and cats can metabolize theobromine, but the digestive system of dogs does not have this function. Methyl xanthine can stimulate the central nervous system of the dog, causing its heart rate to soar, thus causing a variety of poisoning symptoms. Chocolate is very harmful to dogs.

Extension:

Harm of chocolate to dogs:

1. Theobromine contained in chocolate is the main cause of dog poisoning. A kilogram dog may die if it eats 9 grams of pure chocolate.

2. The symptoms of chocolate poisoning are vomiting, dysentery, frequent urination, restlessness, hyperactivity, accelerated heartbeat and breathing, and serious cases may lead to ataxia (unstable walking), cyanosis, arrhythmia, spasm, and even death due to loss of cardiovascular function.

3. Caffeine in coffee, theophylline in tea and theobromine in chocolate all contain methyl xanthine, which can cause pet poisoning.