What Breed Is My Dog?

I rescued this girl from someone who found her and her two sisters dumped at their house. They weren't sure on the breed and kept saying maybe they had Catahoula in them, I'm not sure if they really knew they were Catahoula and the story of them being dumped was just to get rid of them? I thought she looked like she had Australian Shepherd in her, but I've owned one before and she's no where near as fluffy as he was. Now that I'm looking at pics of Catahoula I'm seeing the resemblance. Please help me find out what she is! Thanks.