Sweet little Callie

Well, she has been my longtime companion for 15 years, and given me so much joy. Callie went to the vet today, and we believe she had a stroke. She has difficulty using her right hind leg. The vet pumped her full of fluids and gave me some medicine for her. It tears me up inside to see her try to walk and fall down. She can drag herself around, but what kind of life is that? I know what I need to do if her condition perists or worsens, and I cry whenever I think about it. She's lead a good life, and a long one for a cat. Why is saying goodbye so hard??