Pet urns offer a personal connection with a pet even after passing. Animal lovers can understand the sadness of losing a pet.
People tend to view their pets as part of the family (because they are), with personalities and charms as distinct as any child. When a pet passes, the grief is often just as real and the sorrow as acute as if a human family member had passed away.
Pet urns are one way to help deal with sorrow in the loss of a pet.