I have an 11 year old female who has been losing weight. She's 13 lbs down from 16 since 2014. Took her to the vet for a complete workup. Blood work all came back normal, CBC, SDMA, urinalysis normal. Waiting on results of thyroid. In the meantime vet says I can perhaps feed something to put some weight on her. Any suggestions for a wet food that isn't terribly expensive? I have 6 other cats of varying weights, so everyone gets some kind of special wet. Thanks in advance!