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Body Types
Class A and Class B
The Rat Terrier not only comes in 3 sizes but also two body types. Rats that have a square, long leg look are shown as Class A. Rat Terriers that have a shorter leg length in proportion to body are shown as Class B. The following standards will apply to both classes with the exception of the difference in body to leg length (shown below). These are two separate and unique body styles for the Rat Terrier and to keep them this way, it is recommended that they never be bred together. They have been with the Rat since their American existence, and there are no differences other than body style. Both Class A and B dogs share all of the same wonderful rat terrier traits. To deny either style would be to taint the existence of the breed.
Class A 10:10:9 Ratio
Class A example
Class B 10:8:7 Ratio
Class B example
 
Taken from NRTA's site.
Used by persmission.