How many dogs are living on this earth?

there are nearly 250 types of dogs

This is one of those, how long is a piece of string questions! However, it is estimated that there are over 400 different breeds of dog in the world, but this doesn't take into account the various...

All of them, except the dead ones. Actually that would be like asking "How many grains of sand are there in Mona Loa. Quick answer "A lot". No ones ever counted them.

There are still many undiscovered species in the world.

About 7 billion now inhabit the earth. With current technology the planet can reasonably support between three and four billion. One person is born almost every 5 seconds, and one person dies almost...