It is not at all bad to keep pet urns at home. They do not throw any negative energy into the environment. However, you should give them a clean spot if you keep ashes at home. Else, not even ashes, anything that is unclean would be bad for the environment of your home. If you are wondering about other pets reacting to the urn, then we would like to tell you that, generally, cremated remains do not have any odour. So, it is safe to place it anywhere but not in the reach of other pets or children. Else, they might scatter or consume the same. To hold and keep the ashes of a small pet, you can go for a reasonably small urn. But, you might require a vast urn for a large pet, which can be inconvenient to keep at home.