Formal:
* Amenez la vache. (This is the most direct and formal translation.)
Informal:
* Ramène la vache. (This is a more casual and familiar way to say it.)
More specific:
* Faites entrer la vache. (This literally means "Make the cow enter," implying that someone is being instructed to let the cow in.)
The best translation depends on the context and the relationship between the speaker and the listener.