My boys started lifting between 4-6 months old.My 2 neutered boys never lift inside the house. But my 3 intact boys will. And if 1 of my girls are in heat. Belly band time.
I use an empty clorox bottle wrapped with a pad and place that on a pad & they lift there.
I love to watch a male pup when he first learns to lift. My Bogie boy used to sometimes fall over when he first started lifting.
Speaking of lifting, does anyone have females that lift? I have 2 that do.