I just lost mine to FIP about six months ago—Pumpkin, I miss you every day! He was only 19 pounds at his last weigh-in, but close enough to 20# for government work, as my dad likes to say. Not fat, just a huge, blocky neutered male.
This picture was taken several years ago, and he hadn't achieved full weight, but you get the idea.
I had a 30 lb cat growing up, don't have any photos on the computer. He was a DSH, probably fat but truly enormous. ENORMOUS. He really was the biggest cat I have ever seen. I remember as a small child trying to pick him up, it was almost impossible. He also drooled when he was happy, which was usually when he was on your lap so he would soak your pants, which was lovely.
After he died we found out he had a route that he traveled all over town every day for meals. There were at least 5 poeple feeding him every day even though they knew he was ours they just loved him and couldn't help themselves. He lived to be 19 years old.
At Wayside waifs where I picked up Tater/Bosco. I was sitting at a desk, filling out reams of paperwork, when this GIANT cat sauntered into the room. He was white with a spot on his head. The shelter worker said he was a Turkish van. He was a surrender as his people of six years kicked him to the curb. I bet he was 3 feet long and 30 lbs. Very sweet cat.
He could stand up and reach above my belly button (I'm 5'8") and I could hold his tail without stooping over. He was so big that when I had a repairman in my house, he stopped cold looking into my kitchen and asked, "WHAT is THAT?" Just my sweet big a$$ cat. He was the most mild mannered thing you could image.
"Dogs are man's best friend. Cats are man's adorable little serial killer." -- theoatmeal.com
My British Shorthair is close at 18+ (weighed by the vet), if he were overweight at all he would qualify
He has the biggest paws I've ever seen on a cat, and is large boned and muscular. He's moving past the WBs into Draft size! He's larger than his dad and grandpa (who were both National Winners), though he has an uncle his same size. He's such a sweet boy too.
We adopted "Olivia" (a female conversion of "Oliver", as in "Oliver Hardy" of Laurel & Hardy fame) about a year ago from our local PetSmart. At the time she was so big she could barely turn around in her little cubicle. I came home & mentioned to hubby that I'd just seen one of the fattest cats I'd ever seen in the flesh, & how sorry I felt for her. The words were barely out of my mouth before he was out in the car (gotta love this guy!).
It was love at first sight for them. She was all over my husband like velcro - lol! She was too big for our cat carrier, so we had to buy a new one, plus the shelter had her down as a male named "Johnny" - lol!! Unfortunately, when we took her to the vet for her first exam, she turned out to be quite ill with the feline version of Strep throat, & wouldn't eat at all her first week with us. Vet was quite concerned, but she rallied. In addition, the very tip of her tail apparently was cut off at some point in her life, & she had recovered from what looked like an extremely nasty slice into the bottom of one foot. Further research with the shelter discovered that they had had her for - get this - a WHOLE YEAR!! Which they say is when she picked up all the weight, since she came into the shelter as a stray at between 9-10 lbs., but of course was caged for the year.
Can't say she's lost all that much weight after a year of freedom. Maybe about 3 lbs. If I remember correctly she was around 17.5 at her last exam. Here's a pic of her with her best bud "Ming the Merciless" (our dump capture Siamese).