Thanks a lot for your help. It helps me a lot, however, a little worry about dogs. I will probably try to enter Lhasa from Beijing, where I believe it will be much easier for independent travellers. I will be starting in Lhasa and will spend like 5 or 6 days acclimatizing myself, so, I believe it will be fine. I have seen that you are travelling along the world. That is really great, it is one of my dreams doing something like that.
Well, good travel and very much thanks for your help,
Kind regards and keep in touch
Jesus