It may be a nice idea to have a special book of remembrance at the practice. It's an opportunity for your clients to add special photographs, words and poetry. It also helps them remember their pet as he or she was when happy and healthy.
Many practices send a condolence card to bereaved pet owners. This should be hand-written by the veterinary surgeon who provided the treatment or carried out euthanasia, or by one of the nurses who helped to care for the animal. These cards are usually very much appreciated.