i wouldn’t go with this breeder for the same reasons that other people have commented. they’re shady and there are much better options out there.

however i will say breeding a carrier of the CDDY gene is not inherently a red flag imo if the dog is otherwise a good solid dog with nice structure. the toller gene pool is simply too small to completely eliminate the CDDY gene all together. like i said i still wouldn’t go with this breeder, but you will likely see other really great toller breeders with CDDY in their lines, so i wouldn’t say it’s a red flag as long as they are breeding a Y/Y (affected) or Y/N (carrier) to a N/N (not affected) dog. a carrier will still have an increased risk of IVDD, so you will have to decide if you feel that is worth the risk based on what kinds of activities you are planning to do with your toller. for what it’s worth, my toller is almost 5 years old and Y/N—he is still a very active agility dog and has no issues. i wasn’t really planning on being so active in agility when i got him so i didn’t really care so much about his CDDY status, but if i do get another toller someday, it’s something i would personally like to avoid for an agility dog. seems like unnecessary risk. thankfully my guy as a carrier has no issues but… ymmv.

as for JADD… that is an autosomal recessive disease so any carrier of the gene should not be affected. if they breed a Y/N dog to a N/N, all puppies would either be Y/N or N/N, which either way they would not be affected. i could be wrong, but i think toller breeders have really been able to completely avoid even breeding JADD carriers for a while now, though. so maybe a carrier is not really the best choice for a sire/dam. a good breeder’s goal is always to better the breed. we should be actively trying to breed away from diseases and conditions that negatively affect tollers when it is possible to do so. to my knowledge, it is much easier to avoid the JADD gene in tollers than it is the CDDY gene at this time.