Can't get animation working in script

Not sure if the problem is in the script or the animator, but I can't get an object to animate. I've done it plenty of times before but this time it doesn't seem to be working even though I'm using the same method as all the other times I've done it. I basically want an enemy to animate being hurt every time it is hit by the player.

The enemy does have a Animator component, I have set the isBeingHit bool in the Animator, the script is on the enemy, and I have made transitions with all the animations.

My code:

Code (csharp):

1.  
2. Animator anim;
3.  
4.     void Awake() {
5.         // Initialising
6.         isAlive = true;
7.         beingHit = false;
8.         // References
9.         anim = GetComponent<Animator>();
10.     }
11.  
12.     void Update() {
13.         // If the enemy is alive
14.         if (isAlive) {
15.             // If the enemy is being hit
16.             if (beingHit) {
17.                 // Animate being hurt
18.                 anim.SetBool("isBeingHit", true);
19.                 // Take away from the enemies health
20.                 enemyHealth -= 1;
21.                 // Stop animating
22.                 anim.SetBool("isBeingHit", false);
23.                 // Stop being hit until the player hits again
24.                 beingHit = false;
25.             }
26.      
27.             // If the enemy runs out of health
28.             if (enemyHealth <= 0) {
29.                 // It is not alive
30.                 isAlive = false;
31.             }
32.             // If the enemy is not alive
33.             if (isAlive == false) {
34.                 // Destroy it
35.                 Destroy(gameObject);
36.             }
37.         }
38.     }
39.  

Any and all help is greatly appreciated. Thanks.