My 6year old pitt was diagnosed with lymphoma 3 1/2 months ago. Her health and apatite are fading, but she still seems so happy and full of life. Today her eyes were almost swolen shut and have turned red. I think it may be time to put her to sleep, but how can I suggest that to my boyfriend? We love this dog more than anything, and I would never want her to suffer, but I would hate to end her life too soon. What do I do?