Why does Muffy hate me?

I'm 13 years old, my family's Maltese is about 3. I have never hurt her in any way. She has a bad attitude in general, but she only snaps at me. Sometimes all I do is walk past the coach she's sitting on and she bears her teeth and growls at me. She's never done that to my mother, in fact she's glued to my mother, she follows her wherever she goes and loves her to death. She doesn't do that to my 11 year old brother either. Nor to my dad. The little rat snaps at me when ever I come near her. She actually bit me a few weeks ago. It left a scar! Someone help! She's just so cute, It's terrible that she is such a devil:(

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