This is one of my 3 dogs Gracie. My husband and I are going through a hard time with her right now. She has a back problem that is affecting her back legs. She can't tell what her back legs are doing so she drags them behind her. Sometimes she can walk and sometimes she needs are help. My husband and I go back and forth within ourselves questioning her quality of life. She is still Gracie but her body is failing her. The above picture is before any of this affected her. She can't chase after a ball anymore but she still can bark after the other dogs and she can still give and accept love. When do you say quality of life stinks and a dog needs to be put down?