1, onion/scallion/leek/pepper
Onions and green onions contain disulfide, which is harmless to people, but it will oxidize red blood cells in dogs, which may lead to hemolytic anemia and hematuria. Even heating can't destroy the harmful substances in it, so don't feed the dog onions and green onions.
2. Tomatoes
Tomatoes can cause convulsions and arrhythmia. But this problem is debatable, because some high-quality dog food contains tomatoes.
Extended data
Dog's Diet: Dogs are carnivores. When feeding, animal protein should be prepared in the feed, supplemented by vegetarian ingredients to ensure the normal development and health of dogs. Dogs sometimes eat grass, but they eat very little and occasionally spit it out. Dogs eat grass not to satisfy their hunger, but to clear their stomachs, mainly because of their unique gastrointestinal structure.
The dog's stomach is very big, accounting for about 2/3 of the abdominal cavity, but its intestines are very short, accounting for about13 of the abdominal cavity. Therefore, dogs basically use their stomachs to digest food and absorb nutrients. It is easy to digest meat food, and it is difficult to digest things with "tendons" such as leaves and grass.
Dog's body structure: The dog's bones are naturally suitable for running and jumping. Although human birth control on dogs has changed many appearances, all dogs still retain the basic characteristics they inherited from their ancestors. Dogs' shoulder blades are separated (just like humans don't have collarbones), which allows them to take bigger steps when running and jumping. Dogs walk on four legs, with front legs and rear legs, and the upper claws of most dogs' front legs have degenerated.
The ancestors of dogs are similar in shape to wild dogs in Australia, and the bones of dogs take about 10 months to reach maturity. Today, the bones of human knees for enjoyment have matured in just a few months, while the bones of large dogs like mastiffs need 16 to 18 months to mature. Dwarfs affect the proportion of some kinds of bones, such as short-legged long-eared hounds.
Baidu Encyclopedia-Domestic Dogs
Baidu encyclopedia-dog