my puppy Tibetan terrier,born with deformed leg

this is at 6 days old,

Duncan is now 3 weeks old,he was born with a fused elbow and an underdeveloped front leg,

I took him to my vet,who thinks it most likely he is going to end up having it amputated.

He has 5 siblings all doing very well,Duncan is gaining weight evryday and is looking healthy apart from the leg.

I was wondering if anyone has had a similar experience,and the outcome,

all the other pups will be going to new homes,but I am already so attached to this special little man and he will be staying with me and his mum,