Sorry to hear about Sonny's diagnosis.
As PP has said, it is far worse for you than it is him.
I have lived with more than one blind Basenji and quite frankly…
they live a great life.
None of mine ever starved themself.
They did not pee in their bed or all over the house.
They did not have muscle atrophy.
They were and ARE great companions.
They adapt well to their losses.
The thing about PRA is that it is progressive.... it is not all at one time.
They lose sight over time.
They learn their surroundings and adapt to them.
I lived with my blind Africans for nearly a year before I knew they were blind.
Unlike PRA, they have Juvenile Cataracts.
This was not something we knew about... nor could have predicted to happen.
They didn't take their time going blind.
Many people told me I was nuts that my dogs did not act blind and could easily see everything.
I knew differently after much money spend with specialists!
You have a great dog that you love dearly.
Be happy that he is healthy and a good companion.
Just don't change the furniture!!