The amygdalin in seeds of apples is poisonous to dogs but this too in large quantities.
The thiosulfate in garlic can damage the red blood cells of dogs. So avoid it to give it to your dog.
These nuts are most toxic and they can cause the dogs to vomit, weakness and other issues.
It is toxic to dogs in high quantity so small amounts can be ok.
These sweeteners can cause dogs top to have high insulin levels which are dangerous for them.
The theobromine in chocolates is really harmful for dogs.
It is due to thiosulfate that onions are harmful to dogs, so avoid giving them onions.
Cooked bones can cause constipation in dogs which can be fatal for dogs.
It can be harmful if swallowed a handful by dogs.