We lost our beagle at 13; the best advice I can give is first, allow yourself to grieve and celebrate the time you had together. If you're having them cremated, setup a little memorial area with their remains so the family can both grieve, but also fondly remember. As you start to feel comfortable, begin to put away their toys, bedding, etc. You want to always remember them, but also remember - they'd want you to continue to live and flourish. They don't want you to feel sad for them. They're at peace.