Hi Angelaj, and welcome!
Because F1 and F1b are basic gentic, hybrid terms, your dog is an F1b.
The reason is this: F1 is the FIRST cross of 2 different parents, such as Poodle x Labrador. The "F" just stands for filial, and F1 is the first hybrid generation. F1b stands for an F1 generation bred back to a PARENT breed (either one) so having a Labrador x Labradoodle litter IS an F1b litter, but not typically done, because usually the trait Labrador-people are looking for is the non-shedding trait in the poodle, and the F1b where the parents are F1 x Poodle are most likely to produce almost an entire litter that have that non-shedding coat.
The F1, F1b, etc. terminology is really borrowed from any hybrid science.
I hope this helps!
And yes, post pictures of your doodle!
Because F1 and F1b are basic gentic, hybrid terms, your dog is an F1b.
The reason is this: F1 is the FIRST cross of 2 different parents, such as Poodle x Labrador. The "F" just stands for filial, and F1 is the first hybrid generation. F1b stands for an F1 generation bred back to a PARENT breed (either one) so having a Labrador x Labradoodle litter IS an F1b litter, but not typically done, because usually the trait Labrador-people are looking for is the non-shedding trait in the poodle, and the F1b where the parents are F1 x Poodle are most likely to produce almost an entire litter that have that non-shedding coat.
The F1, F1b, etc. terminology is really borrowed from any hybrid science.
I hope this helps!
And yes, post pictures of your doodle!