Well, an F1 is the first hybrid cross (half golden retriever, half poodle.) This initial hybrid generation has a great deal of variation from shedding to non-shedding, from what appears to be a straggely looking golden to a very poodle like dog. The F1B (think of the B to mean "backbread") is the offspring of a (hopefully high-quality) F1 bread back to a pure poodle. The F1B is desireable because the offspring are usually more consistent, shed less, and still have a high level of hybrid vigor.
Answered by doodledad - 1/1/2012 1:13:30 AM