FHOs on small breed pups are very successful. I had a pup who had both hips done at one time and he was up walking immediately!
It was amazing to me to see him do that! If you use the search option on YT you will find a lot of threads about Legg-Perthes.
I really doubt that he will have a difficult time..he is young and has not had a problem for a long time.
Keep us posted when he has his surgery!
And, welcome to YT!
