It is thought that there are more than 400 breeds of dog. However, I'm afraid there is no exact answer to this question. The basic types of dog are companion dogs, guard dogs, hunting dogs, herding dogs and working dogs. Most dog breeds will fall into one of these larger categories, although there are many other types and subtypes. There are hundreds of different breeds of dog in the world and this number is changing all of the time. Numbers differ depending on whether you take into account cross breeds, how far down the line you class cross bred dogs as a breed in their own right, whether you include extinct breeds, whether you include wild dogs or just domestic dogs and whether or not a new breed has yet to be classified. You can view a list of most dog breeds by following this link en.wikipedia.org/wiki/List_of_dog_breeds .
One of the most popular examples of a cross bred dog which is now a very popular breed all of its own is a Labradoodle. This is obviously a cross between a Labrador and a Poodle and has become a popular dog choice for those with allergies as it doesn't lose as much hair as normal breeds. When cross bred; it is essential that both dogs are pure breeds of their own category otherwise this would not be classed as a cross breed. Dogs need to come with all relevant paperwork and be correctly registered to show that they are a pure breed and have come from a long family of pure breeds.
One of the most popular examples of a cross bred dog which is now a very popular breed all of its own is a Labradoodle. This is obviously a cross between a Labrador and a Poodle and has become a popular dog choice for those with allergies as it doesn't lose as much hair as normal breeds. When cross bred; it is essential that both dogs are pure breeds of their own category otherwise this would not be classed as a cross breed. Dogs need to come with all relevant paperwork and be correctly registered to show that they are a pure breed and have come from a long family of pure breeds.