About Breed

Teacups
These Little guys/gals range from 3-7 pounds. The Teacup Schnauzer is
not recognized by AKC for showing, but can be registered as a Miniature
Schnauzer. While searching for info on these little ones, I came across a 
site that has some great info. Miniature-Schnauzer-Australia.com 

Toys 
These little guys/gals range from 7-11 pounds and 8-11 inches tall. The Toy Schnauzer is not recognized by AKC for showing, but can be registered as a Miniature Schnauzer. While searching for info on these little ones, I came across 2 site's that have some great info.
Find more info here : Miniature-Schnauzer-Australia.com&Toyschnauzer.org

Miniatures
The Miniature Schnauzer is a breed of small dog of the Schnauzer type that originated in Germany in the mid-to-late 19th century. Miniature Schnauzers developed from crosses between the Standard Schnauzer and one or more smaller breeds such as the Poodle and Affenpinscher. The breed remains one of the most popular world wide, primarily for its temperament and relatively small size. The American Kennel Club recognizes only three colors black, salt-and-pepper, black-and-silver. The American Kennel Club considers solid white a disqualification.This being said you can also find other colors such as chocolate, Liver(Chocolate), Liver/Pepper, Liver/Pepper Parti, Liver/Tan, White Chocolate, Salt/Pepper Parti, Black/Silver Parti, Black Parti, Liver Parti, and last but not least merle's. These colors can be found on the pet trade, but are not currently recognized by any legitimate clubs for conformation shows. Miniature Schnauzers normally have a small, squarely proportioned build, measuring 12 to 14 inches (30 to 36 cm) tall and weighing 11 to 15 pounds (5.0 to 6.8 kg) for females and 14 to 18 pounds (6.4 to 8.2 kg) for males. Miniature Schnauzers are often described as non-shedding dogs, and while this is not entirely true, their shedding is minimal and generally unnoticeable.
Find More Info Here: Miniature Schnauzer

Standards
The Standard Schnauzer is the original breed of the three breeds of Schnauzer, and despite its wiry coat and general appearance, is not related to the British terriers. Rather, its origins are in old herding and guard breeds of Europe. Standard Schnauzers are either salt-and-pepper or black in color, and are known for exhibiting many of the "ideal" traits of any breed. These include high intelligence, agility, alertness, reliability, strength, endurance, and affection. Standard Schnauzers are one of the oldest breeds with over 500 years of history. 
Find More Info Here: Standard Schnauzer 
 
Giants 
The Giant Schnauzer is a large, powerful, and compact breed of dog. It is one of the three Schnauzer breeds. Like most large breeds, the Giant Schnauzer needs a fair amount of exercise. The Giant Schnauzer is a powerful breed that demands a steady, yet very gentle hand and with proper leadership, this large breed can not only be a couch companion and jogging partner, but a loyal and a not too overprotective friend that will take a bullet for its owner. Like the standard schnauzer, Coat color is either black or salt and pepper.
Find More Info Here: Giant Schnauzer