There is no easy answer to that one. I still have moments of grief for pets who have been gone for years. When you love a pet, he or she occupies a piece of your heart. When the loved one is lost, the heart aches for their absence. After a while, and it varies from one person to another, the place in your heart is sealed over but the seal is transparent, so you still have the love of that pet but it is less painful. The good news is that your heart has infinite space to love another.