Dexter - didn't lift at all until about 10 mos...it was like something clicked all of a sudden. He seemed to find it fun to lift (don't ask - he just had this goofy look on his face). Now, he squats in our yard and will lift on trees/poles when we go for a walk.
Kirby - oh man, he has the funniest positions (right Annmarie?). He lifts a lot (he was just neutered at 1 yr +)...but then sometimes he'll do this modified squat thing where his one back leg kinda goes backwards and is bent. Now don't even ask, but my husband tried to get a photo of this...it's not the best angle, but it gives a general idea..