After hearing stories of younger dogs spilling, some as young as three, I have been strip testing all my rescues beginning at age two. Since my own individual rescues almost always came from commercial breeders and there is no way to confirm health status on the parents, I would rather be safe than sorry. Since the DNA test has become available, I get them DNA tested.
I have always wondered what causes some Bs to show symptoms at a younger age than the normal 6-7 years old. Some of my rescues have been traumatized and have not had good nutrition while growing up. I have been feeding him a mammal based higher protein dry and canned food with extra water.
This young one was bred by a BYB in Southern Ohio and then sold to an Amish USDA licensed dealer/breeder when he was just a young pup. I rescued him when he was around 8 months old. He would have gone to BRAT with the others I rescued from the same person but he bit me out in the yard when I tried to put a leash on him to bring him inside the house. He was scared of the leash when I held it up but I did not know it at the time because I put a leash on him to get him in the backyard. He had some issues but is doing fairly good now. He was also scared of a broom, moving a rug around, certain loud noises, etc. He was meant to be at my place because of the Fanconi! The only major health issue he had was an undescended testicle and it was way far up, next to his kidney.