This is a progress bar and icon to help you know when to cast Barbed Shot. I couldn't find one that did everything I wanted so I made my own. I have taken multiple situations into account to make it as simple (both visually and functionally) as possible.
1. There is a progress bar that will show you how much longer your pet has Frenzy. It only shows a timer and not the stacks because the number of stacks doesn't matter, you should be trying to keep the buff up anyway. However, it would be very simple to add a stack counter as well.
2. The progress bar will turn red if Frenzy is going to wear off before you are able to cast Barbed Shot again, either due to Barbed Shot's cooldown or the global cooldown. If you get a Wild Call proc and reset the cooldown of Barbed Shot, the bar will turn purple agian.
3. The icon at the end of the bar will grow slightly larger and the border will glow when you should cast Barbed Shot. This will happen in a few cases:
a. You have 2 stacks of Barbed Shot.
b. You have 1 stack of Barbed Shot and the cooldown has less than 1.5 seconds left (to avoid capping stacks).
c. Frenzy has less than 2 seconds left on your pet. The icon will not glow if Frenzy is about to wear off but you will not be able to cast Barbed Shot in time (i.e., the bar is red).
d. Dance of Death has 2 seconds left. Again, the icon will not glow if you cannot cast Barbed Shot in time to try refreshing Dance of Death.
So basically all you have to do is cast Barbed Shot whenever the icon glows, but there is a progress bar to help visually as well. It will only appear in combat and not in a vehicle, or if Frenzy is currently active.
Leave me a comment if you need help adding any personalization, such as adding a stack counter, changing orientation, or changing the number of seconds left before the glowing icon appears.