She is old
It is not a different breed, but a specific gene that causes long hair in German Shepherds. A German Shepherd with long hair is still of the German Shepherd Breed.
As with any breed a number of things.
He could either be shaking due to cold or something has scared him, badly. See where he goes and when he starts it up to evaluate the problem.
Hooligan Causes a Sensation - 1901 was released on: USA: July 1901
poor circulation
lactate
The muscles do not have enough oxygen for aerobic respiration.
Lasctic acid fermentation
The muscles do not have enough oxygen for aerobic respiration.
The muscles do not have enough oxygen for aerobic respiration.
The muscles do not have enough oxygen for aerobic respiration.
The muscles do not have enough oxygen for aerobic respiration.