Since a dog does not have glucose in the urine until usually 5-7 years old, I cannot see euthanizing a young dog just because it DNA tests probably Fanconi affected. There are Bs that are killed by cars or by another illness or by chewing/swallowing an object like a towel before that age. All my rescues are DNA Fanconi tested. I also almost always have them thyroid tested and CERF'd for eye problems. These are just the expenses associated in owning/rescuing Bs.
I am taking care of my 3rd Fanconi affected who will be 11 in December and I do not have a problem in taking care of them. One of the six Amish rescues who was originally supposed to go to BRAT but did not because he had major socialization problems stayed at my own rescue. I had him DNA tested and he turned out to be affected. He will be two in November and will probably permanently live with me.
I train all my dogs, especially rescues, to take pills so that helps tremendously. I am able to come home on my lunch hour to let the dogs out. I have been able to travel via car with the Fanconi dogs.
Missy takes 10 bicarbs a day plus the other pills and supplements added to her food. She is able to see the regular vet, no specialists needed. She is able to eat regular food both dry and canned. She is not in renal failure and she is not having accidents in the house.
I have a rescue boy who has an esophagus problem and is mostly blind in one eye. He eats prescription intestinal dog food both dry and canned. He take Prilosec every day and Reglan every other day and he is also on enzymes and probiotics. He eats with his food bowl level as I place it on the living room coffee table. He sees an internist for ultrasounds and other tests as necessary. I am thankful he has a mild case for if not he would have to eat upright in a special chair. He tested probably Fanconi clear.
I just think there are other diseases that a dog could have that are worse than Fanconi. My elderly BRAT foster, who will be 16 in December, has more problems than a Fanconi dog. She has limited sight and hearing and has arthritis. If I do not take her out shortly after she wakes up and starts walking, she will urinate wherever she is at. She eats well, walks around fast, almost trots and had a complete workup a few months ago and the ultransound was normal for a dog her age. She is not in renal failure. She takes medications and supplements added to her food. She requires eye drops because of a previous eye condition.
If there are people willing to take a Fanconi dog or a young probably affected one, why euthanize them? I have thought about what I will do when Missy dies. I took Missy in when she was not doing well at the other co-owners place. Missy came soon after my other Fanconi dog Zippy passed away, not from Fanconi but from a tumor/growth in the nasal/facial region. Her Fanconi test results were completely normal the day I had to euthanize her because of breathing problems. I have the pill/feeding routine down so it would be easy to take in another Fanconi affected as long as the dog would get along with my other Bs.