Well, I took him to the vet a few months ago for an eye infection cuz Tsunami scratched him and the vet said he seemed a little skinny for his breed/sex. So he told me to give him wet food daily and see if it doesn't help. And it did help but now he's skinny again.

So I guess I'll try the wet food again and then if nothing happens to go back to the vet for diabetes/thyroid tests.