Dogs are the most popular pets all over the world.

From the Chihuahua to the Great Dane, there are over 350 breeds of dog.

And they’re not just pets. Sheepdogs, search dogs or police dogs; dogs can be trained for many missions.

They also help blind or deaf people in their everyday lives.

But why this special relationship?

The dog was the first animal to be tamed by man.

Dogs and men have gotten on since prehistoric times. Men gave dogs food in return for helping them hunt.