F1 = 1st generation puppy.

This puppy is 50% purebred  X 50% purebred

e.g., a Boxer X American Bulldog cross = an F1 Bulloxer

F1b = back cross puppy.

This puppy is 25% purebred X 75% purebred

e.g., an F1 Bulloxer X a purebred American Bulldog cross = an F1b Bulloxer

F2 = second generation puppy.

This puppy is an F1 hybrid dog crossed with an F1 hybrid dog.

e.g., an F1 Bulloxer X an F1 Bulloxer = an F2 Bulloxer

F2b = second generation back cross puppy.

This puppy is a F1 bred to an F1b (hybrid back cross)

Northeast Wisconsin Bully Breeders
A Division of Porterfield Exotics


Hybrid Classifications & Definitions
The generation number of hybrid dogs is noted as F1, F1b, F2, F2b, F3, M or MGB.
Hybrid By Definition
The offspring resulting from the cross between parents of different species, sub-species or breeds pertaining to the offspring produced from the crossbreeding of such.
Crossbreeding By Definition

The act or process of producing offspring by mating purebred individuals of different breeds, varieties or species.
Crossbreeding is usually done with the intent of producing offspring that share the traits of both parent lineages, especially if the traits are beneficial. However, an irresponsible crossbreeding can also produce animals of inferior quality or weaken purebred gene pool.

Blue Bullies 
This page was last updated on -  12/28/2010

F3 = F2 hybrid X F2 hybrid

M=Multi-generation Hybrid.

This puppy is an F3 or higher generation hybrid dog crossed X an F3 or higher generation hybrid dog

MGB = (all dogs in this catagory are over 85% of one breed)
This can be achieved by a F1b dog bred to purebred dog of the same majority breed in the F1b dog (e.g. F1b Bulloxer bred to a Boxer = MGB Bulloxer
Also by any MGB dog then again crossed with the majority breed again.

Northeast Wisconsin Bully Breeders does not breed our two breed hybrids past a 75% X 25% cross.
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