Understandably! I imagine if it can deter much bigger animals like bears, it should work against Cats. That being said, Cougars are completely different creators. I'll leave your question open for discussion. Thanks for asking and have a great day.
There are testimonies of this product on the UDAP website where people have used it against two-legged attackers, mountain lions, bears, coyotes, dogs, etc. The effect is the same on all creatures.