That’s what makes the chew toy sound
We’ve been curious about what’s inside of dog chew toys for quite some time. Earlier, we learned that inside of a chew toy could be another chew toy, but where does the weird sound come from? Well, it turns out that if you dissect a chew toy, you might find a plastic bottle within.
That’s what happened when the OP took apart a ferret chew toy. Instead of spending a ton of money on toys, we can just wrap old plastic bottles in a sock and hand them over to our pets. This is an industry secret that Big Chew Toys doesn’t want us to know.