getcurrentstate.cs

public HorseState GetCurrentState()
{
    bool parsed = false;
    HorseState currentState;

    foreach (string name in Enum.GetNames(typeof(HorseState)))
    {
        if (_animator.GetCurrentAnimatorStateInfo(0).IsName(name))
        {
            parsed = Enum.TryParse<HorseState>(name, out currentState);
            if (parsed)
                return currentState;
        }
    }

    return HorseState.none;
}

public void Play(string trigger)
{
    _animator.SetTrigger(trigger);
}