Our dog cremation urns come in 3 sizes - Large, for a dog who weighed up to 75 lbs; Medium for a dog up to 30 lbs (and the spheres with the wood base for up to 35 lbs); and Small for a dog up to 12 to 18 lbs (the faceted glass spheres will contain up to 18 lbs, and the smaller iridescent spheres up to 12 lbs). For exact volumes and dimensions, please click on the picture to see the description page for each of our urns for dogs.