Cats and dogs in the Western countries are spoiled compared to the ones in 2nd/3rd world countries. In the 2nd/3rd world countries, cats and dogs scavenge whatever scrap they can find left by humans. Nobody cares whether they have enough vitamins or not. Yet, they seem to be surviving well. My mom said that when she grew up in Taiwan countryside, kids would take a dump in the street and the dogs would come and eat it. If feel bad for the dogs and cats in 2nd/3rd world countries b/c they have a much harder life than in the 1st world countries.