This being in the USA and in the south i can't really make a correct judgement.
As far as i know a lot of people call their pet or animal by the colour of their fur (sometimes in their own language or sometimes in a language they think sounds good). And then make it sound more cute by putting -ie at the end. It's not very original but lots of brown dogs are called brownie, many white cats are called blanca, many black horses are called blackie.
But again, reading that the word is considered offensive in the USA it could be wise to consider another name.....