I had a cat that did this. She'd come running nearly every time the toilet was flushed.
Once, I decided to hold her to give her a better view of the bowl when I flushed it.
.
It took a while for the bleeding to stop.
I had one that did the same thing. She even figured out that pushing the flush lever is what did it. She didn't have the weight to push down the lever but I was constantly catching her perched on the rim trying.
Once, I decided to hold her to give her a better view of the bowl when I flushed it.
.
It took a while for the bleeding to stop.