I agree with Kalandra on having a fine needle aspiration on the lump to find out what it is. Our Tessie who we lost recently had a huge very fast growing what we thought to be mammary tumour just above her front leg. My vet felt it was a lymph node that was either swollen due to infection or was cancerous. When we discovered the oral tumour, we euthanized her and didn't go any further with testing the lymph node.
Not only can excessive thirst be caused by kidney disease it can also be caused by diabetes.
It's unfortunate that you have spent so much money already without a diagnoses but sadly that seems to happen all too often. Nobody has unlimited amounts of money to spend trying to cure our animals and nobody can judge you for having spent the amount you have. You have done more than most people would. Those who get criticized are those who say they can't even afford the initial vet visit.
Is he still eating and having quality of life? If so, then keep him on the meds and pray they will help.
Not only can excessive thirst be caused by kidney disease it can also be caused by diabetes.
It's unfortunate that you have spent so much money already without a diagnoses but sadly that seems to happen all too often. Nobody has unlimited amounts of money to spend trying to cure our animals and nobody can judge you for having spent the amount you have. You have done more than most people would. Those who get criticized are those who say they can't even afford the initial vet visit.
Is he still eating and having quality of life? If so, then keep him on the meds and pray they will help.