I can't really consider only ears and a tail a furry fetish. You can get that far easily with props, like the Playboy bunny girls. I can't speak for furries (I have learned that much over the years), but I find it hard to believe they would be satisfied with only that much. It's more or less a human still. In fact in some titles the characters would have two pairs of ears: human ears and animal ears, making it look even more like nothing but external decoration (not personally a fan of that). I don't know if you can have anything official in matters like this, but on imageboard or doujin sites, just ears, a tail, or eyes don't yet get the furry tag.