My sister has cat that looks just like Eliot, her name is Destiny and she has always been thin too. She weighs about 5 1/2 - 6 lbs. Her vet said that she is healthy, some cats are just smaller than others. My Lulu is very tiny too - couldn't tell by looking, all that fur is decieving. Hope everything goes well at the vets.

Janine
Beth
Lulu
Joey