Sorry to be so late on commenting here. There are several Facebook groups you may want to join. 2 are Basenji specific.
Bladder Stones Basenji - https://www.facebook.com/groups/1505737939475808/
Canine Cystinuria - https://www.facebook.com/groups/1264949876904169/
The third group is secret and you need to be Facebook friends with a member in order to join. Contact me if you are interested in joining - Basenji Cystine Bladder Stone Awareness.
To give you an idea of the contrast between Basenjis and Border Collies, my BC once spit out a pill, I said "Blackie" in a disapproving tone, and he picked it up from the floor and swallowed it!
@mryltis
Read this comment from @morgansc within this post dated May 30, 2019, 7:49 AM. It answers your question. Ideally it is best to wait until age 24 months but no early than 18 months.
https://basenjiforums.com/post/177284
@tanza:
Then you are fine…. worst would be a Carrier... no worries....
That's why I chose Katie. After much research into breeders in my area I was very impressed with the bloodlines she produces, and happy with how she has bred to clear any possibility of Fanconi from her bloodline.
ALways good to wait longer to get a pup and know you chose the right breeder. :D