英语翻译many people like to keep dogs as their pets.but do you k

英语翻译
many people like to keep dogs as their pets.but do you know dogs are wild animals long long ago?the first wild dogs were trained by humans in europe about 10000 years.these first "dogs"were not like what we have now.they may have been small wolves.these dogs often came near humabs to steal some food.some of young dogs were adopted by people and grew up with them.humans believed the dogs were of some help to them in many ways.the dogs help them to hunt.they could smell and hear danger before people could.they helped keep people warm on cold nights.so it was useful toraise the dogs .now,there are many different kinds of dogs but they may look quite different from each other.dog teainersthink there are more than 400 different kinds in the world.the number keeps increasing with new kinds.since those early days,humans and dogs have always been together.we should protect them from now on because they are really our friends.