Detect direction of enemy with MoveTowards

Hi!, I’m using the MoveTowards function and is working just fine, but what I need to do is to capture the direction the enemy is moving, per example:
If the enemy is moving towards the player in the “X axis” (horizontal) from “right-to-left” I want to associate that movement to a “-1” value, if it’s moving from “left-to-right” use a “1” and the same with the “Y axis” (vertical).
I need to do this to appropiate show the walking animations of the enemy.
Any ideas of how could I retrieve this directions using the “MoveTowards” function?

//moves towards player during X seconds and then pauses for Y seconds
	IEnumerator EnemyMovesTowardsPlayer()
	{		
		enemyWalking = true;

		if (enemyWalking)
		{			
			if (walkingTimer > 0)
			{
				Debug.Log("Tiempo restante para andar = " + walkingTimer);
				walkingTimer -= Time.deltaTime;
				transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
			}
			else
			{
				enemyWalking = false;
				Debug.Log("¿El enemigo esta andando? = " + enemyWalking);
				yield return new WaitForSeconds (waitingTimer);
				walkingTimer = walkingCoolDown;
			}
		}
	}

This should help.

http://docs.unity3d.com/Manual/DirectionDistanceFromOneObjectToAnother.html

Basically it’s just the difference of the go’s position and the target position. Oftentimes you’ll want to normalize this result to have values between -1 and 1.