Our 14+ year old sheltie has been losing weight even though she's eating the same type and amount of food for past 9 years. Had her to vet and there doesn't seem to be any obvious problems. No anemia, jaundice, fever, etc. She also has started drinking an abundance of water. She has been on thyroid medication for about 8 years and had been doing very well with that. Does anyone have any suggestions on what might be going on. We lost one sheltie (13 yrs 7 mos) to liver disease 18 months ago and none of these symptoms showed with her. Don't want this old girl to go through the same end of life scenario.
