The Valley of Gwangi

The Valley of Gwangi (1969) is a science fiction, western, adventure directed by Jim O'Connolly rated 7.1/10.

A turn of the century wild west show struggling to make a living in Mexico comes into the possession of a tiny prehistoric horse. This leads to an expedition to the Forbidden Valley where they discover living dinosaurs. They capture one and take it back to be put on display, leading to inevitable mayhem.