Meaning of F1, F1b, F2, F2b & F3 In Hybrid Dog Breeds

Meaning of F1, F1b... in hybrid dog breeds

Crossbred dogs and designer dogs are often referred to as F1, F2, or F3, or even F1b or F2b.

It is just the accepted nomenclature in which we can distinguish hybrid dog breeds between the different generations. This naming standard in here applies for dogs, designer dog breeds, hybrids and mixes, but it is also commonly (and scientifically) applied to cats, cattle, plants, and most living organisms (even cells.)

P Generation

These dogs are the fruits of true breeding, meaning they are purebreds and belong to a specific dog breed.

Example: a labrador, a poodle, etc.

true breeding chart
Chart of purebred dogs (c) breedingbusiness.com

F1 Generation

These dogs are the result of the breeding of two purebred dogs. Half of each dog is the mother’s breed, and the other half is the father’s breed.

Example: a labradoodle whose mother is a purebred labrador and father a purebred poodle.

F1 hybrid
Chart of an F1 hybrid dog (c) breedingbusiness.com

F1b Generation

These are F1 backcrossed dogs. They result from the mating of an F1 parent and a P parent. This is used to intensify traits found in the P parent’s breed.

Example: a labradoodle whose mother is a labradoodle and father a poodle.

f1backbred f1b hybrid dog
Chart of an F1b hybrid dog (c) breedingbusiness.com

F2 Generation

F2 dogs are the offsets resulting from the mating of two F1 hybrids.

Example: a labradoodle whose mother is a labradoodle F1 and father a labradoodle F1.

f2 designer dog
Chart of an F2 hybrid dog (c) breedingbusiness.com

F2b Generation

These are second-generation backcrossed dogs. Each F2b dog is the offset of an F1 parent and an F1 backcrossed (F1b) parent.

Example: a labradoodle whose mother is a labradoodle F1 and father a labradoodle F1b.

f2b hybrid backbred dog
Chart of an F2b hybrid dog (c) breedingbusiness.com

F3 Generation

Offsets coming from the mating of two F2 hybrid parents.

Example: a labradoodle whose mother is a labradoodle F2 and father a labradoodle F2.

f3 hybrid dog
Chart of an F3 hybrid dog (c) breedingbusiness.com

Multi Generation

An F3 or higher-generation hybrid dog crossed with an F3 or higher-generation hybrid dog. This is a more generic nomenclature and is mostly expressed using the generation of each parent, such as F4 Labradoodle x F2 Cockapoo.

Example: a labradoodle whose mother is a labradoodle F3 and father a labradoodle F5.

26 comments on « Meaning of F1, F1b, F2, F2b & F3 In Hybrid Dog Breeds »

    1. It is an F1b — look at the article’s chart for F1b and this is exactly that. One parent is purebred while the other parent is F1 (child of two different purebred P.)

  1. If I breed and F1b and F2b together what would the puppies look like and what would you call them.

  2. I have a Cockapoo F1B (mother F1 Cockapoo and father pedigree poodle): I want to bred her with a pedigree cocker spaniel so the pups will have a stronger spaniel gene, but what would the pups be classified as? Cockapoo “F2”?

  3. I want to breed my Miniature F1b Goldendoodle with with a pure breed Miniature Poodle. What woul the puppies be called?

  4. I have F2 puppies- goldendoodles, they are beautiful! When you enter F2 another article comes up showing a golden retriever, all the F2 doodles I’ve seen look like golden doodles f1s, why the golden retriever pic in place of the F2S, I’m guessing they are promoting their F2 bs as they are evening down playing the f1 golden doodles, your thoughts on this?

    1. Hard to say without knowing the other article’s writer’s intent and knowledge. But because these nomenclatures are exactly for dogs who are not purebred (ie. not in a registry), it’s very easy after F1 to just make stuff up to suit one’s needs.

  5. Some ads i have seen for puppies have an “M” classification rather than the “F”. Is that the same thing or does it mean something else?
    Thank you

  6. I have an F1b labradoodle and mating her with an F1bb labradoodle. Would this produce a curly coat in the puppies and would it make the pups an f2 or f3. My girl is very curly so didnt want to breed her back to a pedigree poodle.thanks 😊

  7. I have an f1 mini goldendoodle male and a f2 mini goldendoodle that had a litter of puppies. So what are the puppies?

  8. What generation would the puppies be of a F2 labradoodle with a pure bred poodle? I can’t see any examples of this.

    1. Hybrids rarely have papers since they are not purebred dogs. They may be registered with special/new registries, though, so it’s indeed possible but rare. The bloodline is just the affix of the kennel in most situations.

  9. I have a (F2) golden doodle male and I’m breeding him to a female (P)standard poodle. I do not see a classification on the chart above for what the puppies will be.

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