
I think firstly you need to know what kind of breeding you are referring to.
Here is a useful definition of the kinds of breeders:
http://www.nopuppymillscanada.ca/byb.htmThe kind of breeder most of us support (a breed aficionado that joins with other like minded people to gain knowledge to maintain and enjoy a particular breed, and activities with their dogs, where breeding primarily for for this purpose) versus commercially motivated breeding which falls broadly into two categories, someone casually producing puppies with the hopes of monetary gain, often called a 'Back yard Breeder' right through to large scale purely commercial breeding 'Puppy farming'.
Most of us here would support the first, and be against the latter two.
The divisions between the different kinds of breeders can occasionally be a little blurry.
Numbers of dogs (obviously not in the 100's as is not uncommon with some puppy farmers) is not a good guide to the type of breeder but can be an indication. You can have excellent ethical breeders who breed several litters a year, and unethical poor back yard breeders who only breed the occasional litter.
The
primary purpose to breeding largely will tell you which category breeders fit into.