it may be old age or the mouse might be sick. as strange as it seems some mice in a desperate attempt to relive stress from other cage mates' other pets and even you may pull out their own hair! other cage mates will sometimes pull hair out of another mouse to show dominance in witch case they should be separated. this looks a lot like ringworm.
Yes.
because it has a disease
This mouse may have skin parasites such as fleas or mange.
Just take it to a veterinarian, i can't tell without more information.
It depends on the reason that it's losing hair. Is the mouse itching and scratching? This could be a problem with mites or allergies. See this page for more info: http://mouseranch.com/FYI/itchy&scratchy.shtml. It can also be caused by over grooming, or "barbering." Sometimes mice will barber each other. See http://www.thefunmouse.com/info/hair-loss.cfm. Or it could be that your mouse is just old, and hair loss is part of the aging process. With my oldest mouse, her hair does seem to be quite a bit thinner than it used to be, though she doesn't have any bald patches. I hope one of these pages has information that is useful for you.
It kepps you from losing your hair most of the time but some side effect are losing of hair.
It depends on the length of the hair. If your hair is shorter than your shoulders or at your shoulders you can use one but if it is longer you will need to use two.
Head and Shoulders is very popular when it comes to dry hair. Head and Shoulders is the self proclaimed brand of choice when it comes to dealing with dandruff and dry hair.
You see the white tip on the hair that you are losing because of the dandruff.
Use hair extensions.
Her hair comes just below her shoulders.
no it cannot