Generally it's double the weight at 8wks, not triple.
Sometimes that doesn't work.
All the pups that I raised, this system worked.
I do have a line that slows down their growth about 10wks considerably.
3 of my pups in my last litter stopped growing at 10wks.
So it depends on their line too.
This is just a guessing game.
Triple I never heard that, except there is a thread here last month that someone said that.
Say at 8wks your pup is 2lbs, through my experience. I would say he would be 4lbs as an adult.
Good luck
