My friend has this lovely white cat (dumb as a post, but isn't that a
white cat trait?) who is growing bigger and bigger every day.  Poor
Spot is up to 20 lbs now and is having mobility problems, at only 4
years old.  (he's too fat to clean his backside properly)

She's had him to the vet several times, and has even had complete
blood work done. He gets GOOD food (not the cheap stuff), and very
little kibble (like a tablespoon).  The more she cuts down, the bigger
he gets. He does not free-feed, and he hates people food. He has had
no treats in months.  The odd part is, the other cat in the house is
perfectly fine and the right size.  His thyroid function is on the low
side, but within normal parameters. She thinks he needs medication for
that.

I have a theory about this. My Fin was likewise a very LARGE cat, and
he had a traumatic first year, being a tossed cat.  Spot had 4 homes
in his first year, and has been totally declawed and is definitely a
highly traumatized cat. Even after knowing me for 3 years, he still
hides whenever anyone comes over.  He's extremely skittish.  I think
trauma has a lot to do with the size.

I told her that I'd ask in 'my cat group' because you folks might know
something she hasn't tried yet.  She has done elkhound rescue for
years, so she *knows* animals, but more dogs than cats. These are not
her first cats, though.  There is an eldery elkhound living in the
house, and Spot *hates* her.  Orca(t), the other cat, thinks that the
elkhound is his girlfriend.  *grin*  They are so funny together.

I hope someone here has more advice.  She really wishes there was some
way to get Spot to understand that he'll *never* be moved again.  This
is his foreverhome.

Jane