My ten year old mixeD Lab had an Enuncation(eye removal) due to Glaucoma. He was fantastic for a month and in the previous week has decided not to eat(lost a lot of weight). He will eat treats, but nothing else.Eyesight in the remaining eye (despite medication) is decreasing. Has been walking into objects and not anknowleding things directly in front of him. Contemplating putting him down due to eyeloss, decrease in apetite and increase in water intake. Should I worry about Diabetes? Is Euthanasia the best route?

Increase in fluid intake can be caused by several things ,I think I would be taking dog back to the vet before making any decisions about euthanasia