I have an 18 year old cat who has become very very thin. She's had blood tests and aside from a borderline liver reading her blood tests came back good. We were given liver meds to try her on for a month and see if it helped her gain weight - they didn't do anything. She is very hungry all the time and eats 3 times a day. I feel her elderly cat food (kibble type) and also pouches as she doesn't have many teeth. Has anyone got any ideas on what I can feed her to beef her up a bit?