It may look like a piece of obsidian rock, but it’s actually Gnawt-a-Rock – a durable throw toy is inspired by natural volcanic glass formed by rapidly cooling lava from Pacific Northwest volcanoes.

The Ruffwear Gnawt-a-Rock is made with natural latex rubber, a faceted surface, and an irregular shape.

Treat Dispenser

Internal chamber dispenses kibble or small treats.


It all comes together to keep your pup guessing, whether chasing after its erratic bounce or nuzzling and nosing it around for interactive treat-dispensing to stimulate their mind.

Please note:  All Ruffwear toys are interactive and intended for supervised play. They are not designed to be chew toys. Once the interactive play has finished, place the Ruffwear toy out of your dog's reach and replace with a designated chew toy.

Trail Tested Guarantee

Trail Tested Guarantee (details here)

Size Guide

Available in one size -  4.5 inches