Thiosulfate levels found in onions are so high that it becomes an even more dangerous food than garlic: in small amounts, it can damage and quickly kill dogs, cats and other pets.

 

It contains a substance called Persin, which is extremely toxic to animals. Not only the avocado flesh is dangerous, but the whole avocado plant: seed, bark and leaves is. 

 

Although in cartoons they always give bones to dogs, bones can damage the digestive system of the animal. Break their teeth, get their mouth sore, bones can get stuck in their stomach and get them severe rectal bleeding, the FDA offers up 10 reasons why it is dangerous to reward your dog with a bone.

 

Dogs have a much smaller body and a faster metabolism than us, so they do not process alcohol properly. In small doses is not lethal, but the dog will get nervous and can attack or even hurt himself.

 

Most dogs are lactose intolerant. If they drink milk, they will develop diarrhea. They can not dissolve the sugar in milk causing vomiting, diarrhea and other gastrointestinal problems. If you see that your dog does not like regular milk, give him a lactose-free milk, reduced in enough water.