Freez Doughnut is a customizable, long-lasting dog bone that's also a fillable chew, providing up to 45 minutes of chew-tastic fun Crafted from 100% natural rubber, Freez Doughnut is non-toxic, biodegradable, and dishwasher-safe, making it both pet and earth-friendly. Veterinarians recommend Freez Doughnut as an excellent training tool for canines who tend to chew on inappropriate items. Fit tough chewers Size: Freez doughnut is the perfect refillable bone treat for your furry best friend, it comes in one size, at 4.5" inches diameter, fitting dogs up to 140lbs.