Nowadays, there are tendencies to exaggeration. That is never good. It is selfish and childish to shape beings according to our own wishes. My recommendation is to keep the Tibetan dog breeds as they are: healthy and robust and adapted to their life-task.
I don’t think it is good to feed them with much meat. Today, it always has to be meat. This can cause disease.
I also regret that dog owners are willing to put their sick dogs to sleep. That is like killing a member of the family. Of course, we should help the animal and keep him from suffering. But often it is a selfish decision, as we are not able to cope with the illness, additional work and suffering at hand. Death always causes suffering; we cannot escape that.