You've gotten some great advice...I too would strongly urge you to consider all of the medical options available for you pup. The most important avenue to pursue now, I believe, is to get a firm, definitive diagnosis. If you're able to have him evaluated by a specialist, an oncologist, I think that would be best and allow you to consider all options realistically. When my Lab Jingles was suffering from liver cancer, she also had periods of blindness My thought and prayers are with you and your beloved pup. Please keep us updated. Sandra