my kiki at around 18 years old lost some weight in a few months that i didn't notice to to much(appeared pretty normal)
but i was calling my vet and bringing him in...come to find out after
normal bloodwork...it was his mouth or teeth.(or even a tounge ulcer)
he said it was mouth cancer.
i thought that it may have been an infection from a canine tooth out and he didn't want to tell me.
I liked the vet a lot so i didn't question...but we had to put him down.
I was devistated because i felt bad that he was in pain all that time and i didn't know.
He was eating but not much.
but i know it was something in his mouth that made him ill...i felt terrible not knowing earlier.

i would have a good look inside his mouth lori if you can...or have the vet do it.
anyway...i hope he is ok.