F1, F1b and F2 Cavapoos Explained

What the letters and numbers mean

The "F" stands for "filial" — it's just breeder shorthand for which generation of the cross a puppy is. The number tells you how many generations in, and a "b" means "backcross" (bred back to one of the original purebred lines, almost always the Poodle).

Here's the whole system in one place:

F1: a purebred Cavalier King Charles Spaniel crossed with a purebred Poodle. A first-generation Cavapoo, roughly 50% each.
F1b: an F1 Cavapoo crossed back to a Poodle. Genetically about 75% Poodle, 25% Cavalier.
F2: two F1 Cavapoos bred together.
F2b, F3, multigen: further generations, increasingly used by breeders trying to lock in a consistent coat.

F1 Cavapoos: the classic cross

An F1 is the "original" Cavapoo and often has that soft, wavy, teddy-bear look people fall for. Because you're combining two very different coat types, F1 litters are the most variable — even within one litter you can get a straighter, Cavalier-ish coat on one pup and a curlier, Poodle-ish coat on its sibling.

F1s are generally low-shedding but not the lowest, and how allergy-friendly an individual is depends on the coat it happened to inherit. If shedding is your priority, an F1 is a slight gamble.

F1b Cavapoos: curlier and lower-shedding

The F1b is the generation most often recommended to people with mild allergies, because that extra dose of Poodle makes the coat curlier and lower-shedding, and stacks the odds toward a more "hypoallergenic" result. Kimi, whose page you'll find on this site, is an F1b — a proper city gentleman with the curlier coat to match.

The trade-off: a curlier, denser coat generally means more grooming, because tighter curls mat faster. If you love the idea of minimal shedding, go in knowing you're trading it for brushing time. (Our Cavapoo grooming guide covers how to stay on top of it.)

F2 and beyond: less predictable, not lower quality

F2 (Cavapoo × Cavapoo) sounds like it should be more consistent, but genetically it's actually the least predictable generation — the traits from both original breeds can resurface in all sorts of combinations. Reputable breeders working on multigen lines (F2b, F3+) are usually trying to breed toward a reliable low-shedding coat, which can be a good thing when done carefully.

The generation label alone doesn't tell you a puppy is well-bred. Health testing of the parents matters far more.

Which generation should you choose?

There's no universally "best" Cavapoo generation — there's the one that fits your home:

Allergies or a strong preference for minimal shedding? An F1b tilts the odds your way.
Happy to brush regularly and want that classic wavy look? An F1 is lovely.
Whatever the generation, prioritise a breeder who health-tests both parents (hearts, eyes, hips and relevant DNA panels) over one who leans on the label as a selling point.

Meet the parents, ask what the adults' coats are actually like, and remember that temperament and health outlast coat type.

Frequently asked questions

Is an F1 or F1b Cavapoo better?

Neither is objectively better. F1b Cavapoos are curlier and lower-shedding, which suits allergy sufferers, but need more grooming. F1s have more variable, often wavier coats and can shed slightly more. Choose by shedding tolerance and grooming commitment.

Which Cavapoo generation is most hypoallergenic?

F1b, generally. The extra Poodle content makes a low-shedding, curlier coat more likely — but no dog is truly hypoallergenic, so spend time with the specific dog before committing.

What does the 'b' in F1b mean?

It stands for 'backcross' — the puppy was bred back to one of the original purebred lines, almost always the Poodle, to strengthen Poodle traits like a low-shedding coat.