:goodpost:Inbreeding itself is not bad, but it brings out recessive traits. So it should only be attempted by an experienced breeder, not be done just because they happened to have those two dogs handy, or other similar goofy reasons. You're limiting the gene pool and doubling up on what is back there. If there's anything hiding in that pedigree, like a health problem, inbreeding on those dogs is going to bring that to the fore. So it could be good, or it could be very bad. What is produced depends on what is in the pedigree.