Loki is now 10 weeks and since we've first had him I've sometimes noticed that his front legs (one at a time) do a kind of wobble, not shaking, when he's sitting. I've only noticed it when looking and talking to him so maybe it's when he's getting kind of excited for the attention or something? Should I mention it to the nurse at the vet's tomorrow when he goes for his next vaccination or have you noticed this in any of your puppies before?
I think it's always worth asking if you're concerned, and booking in to see the vet if the nurse thinks it's worth it. Shadow often trembles from excitement, so if he only does it when he's excited about something, it's probably just that
I would get him checked out. But I must say all of my pups, except Tatze, have had a front leg wobble from time to time. I think it's due to the fact that their bones are very 'far apart' when tiny.