I had a yorkie once that had mostly straight hair and the other was mostly curly. My current girl has very straight hair on her head and most of her body is curly/wavy. I keep her body hair short with some length on her legs. When cut short the body is very straight, but she has curly leg hairs
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R.I.P. Mick & Mandy (before 2010), Mila - 4/3/15, Chloe - 2/18/16, Kimchi - 6/2/2021