Scripting Reference
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Animation.Stop

function Stop () : void

Description

Stops all playing animations that were started with this Animation.

Stopping an animation also Rewinds it to the Start.

JavaScript 
// Stop all animations
animation.Stop();
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        animation.Stop();
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        animation.Stop()

function Stop (name : String) : void

Description

Stops an animation named name.

Stopping an animation also Rewinds it to the Start.

JavaScript 
// Stop the walk animation
animation.Stop("walk");
using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        animation.Stop("walk");
    }
}
import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        animation.Stop('walk')