Individual immune problems? Mike P? Tracker?

Is it common to see mule deer with mange?tracker wrote: If it is warm-blooded and has hair it can get mange.
Overall health and immune system strength will hold it off in healthy populations, but it can affect just about any critter when there is a weakness or stress to their systems.
P-22, our Griffith Park lion, is showing signs of mange. He'll probably get a dose of something next time his collar batteries are changed.
In truly wild areas, no. In what I call "urban wildlife", terms like common, normal, etc., have a different meaning. The condition the deer in the pic has could be a couple different things.Is it common to see mule deer with mange?
No doubt. He may be looking for a girlfriend, which has been the downfall of many a Hollywood male who walks the streets.As for P-22, mange may be the least of his problems if he continues to walk down the neighborhood streets.