Animation won't play EVERY time it is called

I got a running game with the player running automatically and the only inputs for controls is shooting and jumping, they both work. The animation for shooting does work when I want it to, SOMETIMES. I don't know why, but it will occasionally not play the shooting animation when it's supposed to, sometimes it does that several times in a row and then will work again.

Here is the code that calls the animation for shooting

 void zombieShoot()
     {
         if(Input.GetMouseButtonDown(0))
             {
                 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                 RaycastHit hit;
                 
                 if(Physics.Raycast(ray, out hit))
                 {
                     if(hit.transform.tag == "zombieObstacle")
                     {
                         
                         dude.animation.Play("shoot");
                         gunFlash.Play();
                         audio.clip = gunShots[Random.Range(0,2)];
                         audio.Play();
                         
                         
                     }
                 }
             }
     }