I am sad to read your post.
The breeder you got your dog from should have given you info on fanconis and any fanconis that runs in their line…
Who did you get your b from?
Fanconis is a kidney issue b's and even humans have.
The dogs drink vast amounts of water and flush all the chemicals they need to live, out in their pee.
Get some test strips, for humans spilling sugar, and put the strip under the dogs pee, or on the dogs privates right after they pee. Its not expensive, about $10 a jar...go to Walgreens or a drug store and ask. There are a few different brands...
If the strips change color, then you need to get to the vet and get your basenji on the fanconis protocal asap.
Its a bunch of pills you give the dog every day to keep the dogs body running properly.
At this time, there is no cure for fanconis...just treatment that slows the damage to the dogs kidneys down...but it is progressive and will shorten your b's life.
The person you got the dog from should have been upfront with you re this.
My advice is to phone them and find out how many dogs in their line have had this crop up.
If they say never, then I would not think they are being truthful.
I have seen wonderful breeders who do everything right, have this crop up.
BUT they stack the deck in favor of the dogs they breed and they tell the buyers what is happening.
Good luck.
I know of some wonderful fanconis support lists to suggest if this crops up in your basenji.
STRIP TEST every month! the first of every month is when we do it.
THe sooner you find out, the sooner you can slow the damage to your dogs kidneys.