Hello and thanks for researching this very important question!
Cinnamon is NOT toxic to cats, dogs or people...make sure you use a product that has been processed for human consumption to make sure it is pure.
It may make your cat Sneeze since it is pretty finely ground, and attractively scented!!
If you need additional support at this time, please click "Reply", otherwise I thank you in advance for your "Accept" and ask that you let me know if this Anti-ant Remedy works!!
I think then that the cinnamon would be less irritating to your pets than the pepper, for sure!
Thanks for the tip!!