At its best, breeding is a blend of science and art. The skilled breeder has at least general knowledge of genetics and health, and in-depth knowledge of the breed standard and conformation points of his chosen breed. Most are fiercely loyal to their dogs, and are concerned about each individual animal.
At worst, breeding can be a slipshod enterprise in which the major concern is profit, with little regard to the health and welfare of the dogs involved. These often take the form of so-called 'backyard breeders' (the term for random or ignorant breeding conducted on a small scale), and 'puppy mills' or 'puppy farms' (larger businesses). It must be pointed out, however, that many excellent breeders run small-scale programs in their homes, barns, or back yards, and there are profitable large-scale operations run with knowledgeable staff and superlative veterinary care, so size and motive alone are not indicative of the quality of the breeding program.
The birth of a litter of purebred puppies is recorded on a breed registry maintained by a kennel club. Such registries are not the exclusive province of show dogs, as is sometimes thought; the clubs of working dogs also maintain records of their dogs' lineage. Requirements for the breeding of registered purebreds vary from club to club. Most breed clubs allow for any registered puppy to be bred from once it reaches a suitable age. Some clubs maintain an adjunct or limited register, for puppies of purebred parents not deemed to have the qualities for showing or breeding, or who exhibit a fault. A few clubs, such as the Swiss breed club of the Greater Swiss Mountain Dog, the Jack Russell Terrier Club of America and the Mini Foxie Club of Australia, Inc. have additional, strict requirements for the certification of adult dogs before breeding.
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Looking Looking Looking
Hmm a bit of interesting stuff there. So where do you go to get a dog for yourself? There are so many breeders. As this site is dedicated to Jack Russell Terriers I guess the decision on what breed is pretty well taken care of. I have found this site to be very helpful, both for breeders wanting to sell puppies and the person looking to buy a puppy. It is well worth a look. It has a drop down menu with a world wide index so no matter where you are there is a breeder near you.

Donny
And then you find him
However if it is a loveable companion you are after there is always the animal shelter to consider. As previously mentioned Donny came from our local pound. He is a very affectionate dog, and appears to have had a hard life before living with me. I just get the feeling he is so thankful for each little thing I do for him. I doubt he would openly tell you this, but I believe he secretly even appreciates his weekly bath.