I'm not sure what you mean. a pedigree dog that isn't registered with the kennel club isn't illegal. or do you mean dogs that have been banned like pitbulls?
Its impossible to say due to strays and those that are bred to fight illegally.
A puppy mill is any place where an outrageous number of dogs are bred and raised illegally. It is often known as "backyard breeding" because it is done without the knowledge of the city.
None. Dogs and plants cannot breed
Many dogs are used, but the most common is the pit bull.
There are about 100-250 different pure bred dogs in the entire world. yes i agree but maybe even 150 to 300.
depends.. why is an unhealthy dog being bred?
Breeding dogs is common, and many people do it because they say if one dog is a champion, then their offspring will become dog show, obedience, or agility chanpions too. Others do it to make a lot of money off of pure-bred dogs.
No two dogs simply make a collie. They are the result of high drive herding dogs from multiple countries, which were bred many hundreds of years ago. They're an ancient breed that can only continue by being bred collie-to-collie.
Yes they can. All dogs are actually the same species, despite their apparent differences. They have been selectively bred to produce many different sizes and shapes, but genetically they are not so different. In fact they are still the same species as the wolves they were bred from.
There are many different breeds bred by puppy mills, usually popular breeds that you see in the pet stores, very often these dogs will have health problems, and sometimes abused in their time with the parents' owner.
Dogs are our familiar pets which have been bred from wolves. Many different shapes and breeds exist. Prairie dogs are small ground squirrels which live in burrows in the plains of North America.
Mixed, or cross-bred dogs usually exist for one reason. Strays. Many dogs, that are from a POund have been cross-bred because a house-dog got away and bred or the are a mix of 2 strays. However, cross breeds are becoming increasingly popular, and some breeeds are being formed currently.