What Colorado four legged animal has a long thin tail looks like cross between fox coyote and dog NOT bushy tail?

The animal you're describing is most likely a coyote.

Here's why:

* Long, thin tail: Coyotes have a long, slender tail that's not bushy like a fox's.

* Fox, coyote, and dog mix: Coyotes are indeed a canid, and their appearance shares similarities with both foxes and dogs. They have a pointed snout, erect ears, and a lean build, like a fox, but they are larger and have a more dog-like coat.

* Colorado habitat: Coyotes are common throughout Colorado and thrive in a variety of habitats.

While other animals might have some similarities (like a fox), the combination of a long, thin tail and the "fox-coyote-dog" mix strongly points to a coyote.