A keepsake urn is always a smaller size urn. For some pets it may be just the right size urn for remembrance of the cherished lost pet. A pet can be anything from a dog, cat, bird, rabbit or fish.Keepsake urns usually houses a part of the pets ashes, but does not have to. Keepsake urns can be shared between family members or kept separate. Some keepsake urns can be engraved and some can not. Keepsake urns may be less expensive than larger urns.