Size: Do you prefer a big dog or a small dog? Although one cannot generalize characteristics of dogs, size is often a good indicator of the kind of personality a dog has. Small-sized dogs tend to be yappy, snappy, and pure bundles of energy. They can be easily carried around in one's purse or arms. Chihuahas, Daschunds, and Poodles are some of the most popular small breeds. Big dogs make good protector dogs, but they need regular exercise.

Skills: Throughout history, humans took advantage of dog's plasticity to make them perform certain tasks. Some dogs were bred to herd sheep, do cattle work, or guard livestock. Others were bred for hunting and tracking. Most modern dog breeds are non-working dogs but are great for showmanship or as lap dogs. Knowing where the breed descended from and what it was originally designed will aid in your decision making.

Physical Characteristics: For some dog breeders, physical characteristics are the most important consideration for selecting a dog breed. Do you want a dog with a curly coat? Perhaps you prefer a spotted dog or one with droopy eyes.

Temperament: Dogs, particularly purebreds, have predictable personality traits. If you want a dog with aggressive tendencies, you have to pick a dog that possesses that trait - Rottweilers, for example. Chihuahas are spunky. Papillons are playful but timid. The Border Collie is intelligent and trainable. Every dog breed has its unique set of characteristics and temperament - many of which are carried on the genes and passed on to their young.