A sound module for insertion within a pet toy. The sound module is in the form of a shell housing an integrated circuit, power source and speaker, the integrated circuit being programmed to generate a signal to the speaker for creating an audible sound. The shell is in the form of a sphere, oval, square or rectangle ideally having a wall for thickness of between 2 mm and 5 mm and composed of acrylonitrile butadiene styrene.
