F1 vs F1B vs F2 Doodle: What the Generations Mean and Which to Choose

1What Do F1, F1B and F2 Mean in Doodles?

The "F" stands for filial generation, a term from classical genetics, and the number counts how many generations the line is from the two original purebred parents. A "B" means backcross: a Doodle bred back to one of the parent breeds, almost always the Poodle.

• F1: purebred (for example Golden Retriever) × purebred Poodle. 50% Poodle.
• F1B: F1 Doodle × Poodle. About 75% Poodle. If the backcross is to the other breed it is still called F1B but is about 25% Poodle, so ask which.
• F1BB: F1B × Poodle. About 87.5% Poodle.
• F2: F1 × F1. About 50% Poodle on average, but the widest spread of any generation.
• F2B: F2 × Poodle (about 75%) or, in some breeders' usage, F1 × F1B (about 62.5%). The two definitions are not the same dog.
• F3: F2 × F2, or any pairing of two second-generation-or-later Doodles. Usually 50 to 60% Poodle.
• Multigen: Doodle × Doodle for three or more generations. Most established lines sit between 50 and 75% Poodle.

No kennel club or scientific body defines these labels, so "F2B" can mean two pedigrees and "multigen" almost anything. And the percentages are averages, not measurements of any one puppy.

2Why "75% Poodle" Is Not Really 75%

Only the F1 figure is exact, because an F1 receives half its chromosomes from each parent. After that, each egg or sperm carries a random shuffle of retriever and Poodle chromosomes, so two F1B littermates can differ noticeably in Poodle content and two F2 littermates can differ enormously: one near 70% Poodle and curly, its sibling near 30% and looking like a wavy Golden. This is why experienced breeders avoid F2 litters, and why a commercial DNA test so often disagrees with the paperwork.

3How Generation Affects Coat and Shedding

Dog coat type is controlled largely by three genes, identified in a 2009 study in Science of more than 1,000 dogs across 80 breeds. Two matter for Doodles:

• RSPO2 controls "furnishings", the longer muzzle and eyebrow hair that gives a Doodle its teddy-bear face. The variant is dominant, so one copy is enough. Poodles carry two copies; retrievers, spaniels and most other parent breeds carry none.
• KRT71 controls curl. Poodles carry two copies; most other parent breeds none. One copy usually gives a wavy coat, two curly, none straight.

Run the generations through those two genes:

• F1: every puppy gets one furnishings copy and one curl copy from the Poodle. Nearly every F1 is furnished and most are wavy, which is why F1 litters look uniform and shed less than the retriever parent but more than a Poodle.
• F1B (to Poodle): the F1 parent passes on a curl copy half the time; the Poodle always does. Roughly half the litter is curly, half wavy, all furnished. Shedding is lower on average than F1, which is the real reason F1Bs are sold to allergy-conscious buyers.
• F1BB: around three-quarters curly; essentially a Poodle coat with Poodle grooming.
• F2 (F1 × F1): each parent passes each gene on half the time, so on average one puppy in four has no furnishings at all. These "improper coat" Doodles look like a smooth-faced retriever and shed like one. The rest range from straight-with-beard to curly.
• Multigen: depends on the breeder. Good ones DNA-test for furnishings and curl and pair accordingly; poor ones produce the same lottery as an F2.

Furnished, curly coats trap loose hair instead of dropping it, which is why they appear not to shed and why they mat so easily; a curlier F1B sheds less but needs more brushing, as our guide to whether Doodle dogs shed explains. Because both genes are cheaply testable, the honest way to promise a coat is to show the parents' RSPO2 and KRT71 results, not a generation label.

4Does Generation Affect Size?

Only indirectly. Size comes from the size of the Poodle used (Toy, Miniature or Standard) and of the other parent, not from the generation number; an F1B backcrossed to a Miniature Poodle will usually be smaller than its F1 parent, one backcrossed to a Standard Poodle will not. What generation changes is predictability: an F1 litter from a 70 lb Golden and a 45 lb Standard Poodle usually lands between those figures, F2 litters spread wider, and multigen lines bred to a consistent size are the most predictable. The parents' measured height and weight always predict a puppy better than the label.

5Does Generation Affect Temperament?

Not in any way that has been demonstrated. The common claim is that F1s balance a retriever's easygoing nature with a Poodle's intelligence, while F1Bs are more "Poodle-like": sharper, more sensitive, more reserved with strangers. That is plausible but untested, and individual variation within a generation dwarfs any average difference between generations.

What has been tested is whether Doodles land between their parents at all. In 2026 the Royal Veterinary College published a study of 9,402 UK dogs comparing owner-reported behaviour (C-BARQ) in Cockapoos, Cavapoos and Labradoodles with their parent breeds. Across 72 comparisons the Doodles scored worse than a parent breed in 32, better in 7 and no different in 33. Cockapoos scored worse in all 16 comparisons where they differed, including owner-directed aggression; Labradoodles came out best, worse in 5 and better in 6. The authors found "little support" for the idea that crosses land neatly between their parents.

The study recorded generation but did not analyse it. A generation label is not a temperament guarantee; the parents' temperaments, early socialisation and training matter far more.

6Does Generation Affect Health? The Hybrid Vigour Question

No generation has been shown to be healthier than another, and the broader claim that Doodles are healthier than purebreds because of "hybrid vigour" is not supported by the best available evidence.

Hybrid vigour, or heterosis, is real in livestock breeding: an F1 between unrelated lines is unlikely to inherit the same recessive disease genes from both sides. In theory the effect is strongest in F1s and fades in F1B, F1BB and multigen dogs, which are bred back towards one breed or within a closed Doodle population.

In practice, a 2024 Royal Veterinary College study of 9,402 UK dogs under five years old compared 57 common disorders in 1,856 Cockapoos, 583 Labradoodles and 985 Cavapoos against their parent breeds. In 296 of 342 comparisons (87%) there was no significant difference; the crosses had higher odds in 24 and lower odds in 22. Labradoodles had lower odds of hip and elbow dysplasia than Labradors but higher odds of ear infections, and all three crosses had higher odds of vomiting and diarrhoea than Poodles. The authors concluded that the results "offer little support" for hybrid vigour.

The study did not analyse by generation, and only 20% of the dogs were confirmed F1s, so mixed generations may have diluted any F1 advantage. But the lesson holds: a Doodle of any generation inherits the risks of both parents. An F1B Goldendoodle still carries the Golden Retriever's cancer and heart risks, now with a larger dose of the Poodle's, including Addison's disease, sebaceous adenitis and patellar luxation. Our guides to Doodle health problems and hip dysplasia cover what to watch for.

Health comes from testing, not from a letter and a number. The Goldendoodle Association of North America requires breeder members to test breeding dogs for hips, elbows, eyes, heart and patellas plus a DNA panel (prcd-PRA, GR-PRA1 and GR-PRA2, von Willebrand's disease, ichthyosis, degenerative myelopathy), with results on the Orthopedic Foundation for Animals registry; the United Poodle Association publishes a similar minimum for Poodles. Ask for those certificates for both parents, whatever the generation.

7Which Generation Is Best for Allergies?

None is hypoallergenic, and no breeder can promise one will be. People react to proteins in dander, saliva and urine, which every Doodle produces whatever its coat. Curly, furnished coats drop less dander around the home, so some allergic people find a curly F1B or F1BB easier to live with; others react just as badly. If allergies drive the decision, choose a breeder who DNA-tests for curl and furnishings, then spend time with the actual puppy, more than once, before paying. Our article on whether Doodles are hypoallergenic covers the research.

8Which Generation Suits Which Buyer?

Match the generation to what you need rather than to the breeder's price list.

• F1: you want the classic shaggy, wavy look, accept moderate shedding and want the easiest Doodle coat to maintain.
• F1B (to Poodle): you want the lowest-shedding coat you can reasonably get, accept that about half the litter will be wavy, and are ready for Poodle-level grooming: brushing to the skin several times a week and clipping every six to eight weeks.
• F1BB: you really want a Poodle coat; ask whether a well-bred Poodle would serve you better.
• F2, F2B and F3: only if you do not mind which coat you get, or the breeder can show coat DNA results for both parents.
• Multigen: you want the most predictable coat, size and type, will pay for it, and will insist on registered pedigrees and documented testing. The Australian Labradoodle, bred to a written standard under the Australian Labradoodle Association of America, is the best-developed example.

9How to Verify a Breeder's Generation Claim

Ask for both parents' pedigrees and health certificates and check them yourself; a label is only as reliable as the paperwork behind it.

• See both parents' registrations. For an F1, both parents should be kennel-club registered; for an F1B, the Doodle parent's parents should be. Multigen breeders should hold pedigrees registered with GANA, ALAA, WALA or a similar club.
• Ask which breed the "B" refers to. An F1B backcrossed to a Golden Retriever is 75% Golden and will almost certainly shed.
• Ask for coat DNA results. A breeder promising a low-shedding litter should show furnishings (RSPO2) and curl (KRT71) results for both parents. If they do not know what those are, the promise is a guess.
• Check health certificates against the registries. OFA results are searchable online by registered name. "Vet-checked" is not health testing.
• Consider a DNA test after purchase. Ancestry tests estimate the Poodle percentage, though Embark cautions that a percentage cannot settle registered purebred status. Because littermates vary, 68% does not mean an F1B was mislabelled; near 50% on a puppy sold as F1BB would be.

10How Much Do F1, F1B and F2 Doodles Cost?

Prices vary widely by country, region, cross, size and breeder, so treat every figure as a rough guide; the generation premium is often larger than the real difference between the dogs.

• F1: usually the baseline. In the United States, F1 Goldendoodles and Labradoodles from health-tested parents commonly list at around 1,500 to 3,000 dollars in 2026, with miniatures and fashionable colours at the upper end.
• F1B and F1BB: typically 500 to 1,500 dollars above an equivalent F1 from the same breeder. The extra buys better odds of a curly coat, not a healthier or better-tempered dog.
• F2: sources disagree; some breeders price F2 litters below F1s because of the coat lottery, others above. There is no good reason to pay a premium for an F2.
• Multigen and Australian Labradoodle: usually the most expensive, often 3,000 to 5,000 dollars or more in the US, when registered pedigrees and multi-generation testing are actually present.

UK, Australian and European prices follow the same pattern in local currency. A very low price for any generation is a warning sign.

11F1 vs F1B vs F2 Doodle: Pros and Cons

Potential advantages

• F1: uniform wavy look, the easiest Doodle coat to groom, usually the lowest price
• F1B: about half the litter curly, the lowest shedding of the common generations
• F1BB: nearly Poodle-level coat consistency
• Multigen: the most predictable coat, size and type from a club-registered, tested breeder

Potential challenges

• F1: sheds more than people expect
• F1B and F1BB: Poodle-level grooming for life, a higher price for a coat that is still not guaranteed, more Poodle health risks
• F2: about one puppy in four with no furnishings and a shedding coat; the least predictable generation
• Multigen: expensive, unregulated as a term, and quality varies enormously between breeders

12Final Thoughts

The generation system is useful for one thing: estimating the odds of a furnished, curly, low-shedding coat. F1 gives a wavy coat almost every time; F1B improves the odds of curl at the cost of more grooming; F2 is a gamble; multigen is only as good as the breeder behind it. None of it predicts health, temperament or allergy suitability.

Choose the breeder first, then the parents, then the generation. Ask for coat DNA results if the coat matters, health certificates in every case, and the parents' measured sizes. Judged that way, a well-bred F1 beats a badly bred multigen every time. For the wider picture, our complete Doodle Dog guide is the place to go next.