Are these Silvervine Chew Sticks harmful for cats?
NO, its harmless for your cats.
The Silvervine Chew Sticks are made of natural material. Your cat may have reactions such as excitement, sneezing, drooling, rolling, running, purring, etc. Which will disappear in about 30 minutes.
Why is my cat not interested in these sticks?
98% of cats like these cat chew toys very much. If your cat not interested in these sticks, you can grab it in your hand to play with your cat.