Nowadays many popl lik to hav dogs as thir pts. Dogs ar frinds of man not only bcaus thy ar lovly but also bcaus thy ar faithful to thir mastrs. Dogs can do a lot of work for man. Thy play with us. Thy hunt with us. Thy kp door for us. But long ago, dogs all ovr th world wr wild. Dogs can dat back to th Ston Ag. All dogs hav th sam ancstor. It is blivd that thir ancstor was much lik a wolf. Othr animals, such as th fox, cam from this ancstor, too. Hundrds of thousands of yars ago, man bgan to tam wild dogs. Aftr th dogs wr tamd, thy wr traind. Th strong dogs bcam working animals. Thy wr traind to pull havy loads. Thy larnd to kp an y on th shp and othr animals. Working dogs had othr jobs, too. Som dogs wr not strong. But thy could hlp man hunt for gam. Othr dogs wr bst as pts. Today, thr ar mor than 100 kinds of dogs in th world.