Why Wont My Aussie's Hair Grow Long?

My Aussie's hair is so short and wont really grow, I brush her often and she still is losing hair like you wouldn't believe. I have her on Taste of the Wild when I have enough money for it and even then she eats like a bird. You have to literally sit down next to her so she will eat. That's another problem she never wants to eat and will still run all day. It's been this way for 3 years. Any suggestions?

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