I can't say for sure that Trixie is this exact combination, as we haven't traced her genetic history... but not only does she have those cute ermine collar spots all around her neck fur, her behavior is spot on Border Collie. I got a book on BCs, which I devoured as I responded "yes, yes, yes" to every attribute. Our vet agreed. As did a neighbor of my in-laws who breeds Border Collies. She is super brilliant - a mixed blessing for a dog owner, needs a job all the time, loves to herd people, cats, toys, and her brother, runs like the wind, and adores frisbees. If only I could test her with a sheep! She is definitely intense; an alpha girl for sure. But also super affectionate and a world class snuggler. When she's been on a five-miles hike, she'll finally chill out on the couch. My husband is more of a corgi purist, as I know some are - when Trixie is bad, he says, "well, she's a mixed breed" - just to be mean. But I volunteer at a shelter and meet all kinds of pups who are awesome mutts... I surely love Trixie to bits and can't imagine a better dog. I'll definitely check out the blog! Thanks!