Yo, with all due respect, he needs to see a vet and loose some weight
Obese cats have issues grooming themselves, which causes their fur to look disheveled, as well as poop buildup on their butts
Also, all that extra weight causes arthritis and joint pain. Not to mention a host of other health complications and organ failure
Also also, be aware that losing weight too fast can be fatal to cats (fatty liver disease), so it's important to discuss this with your vet
Girl With The Dogs has some informative videos on overweight cats
How are you holding up?
Because I am a potato