Is he an adult? I'd feed him an adult mouse every two weeks. Take him out and have him do the cornsnake treadmill, or climb stairs, or swim, or crawl on the floor, as often as possible.
It can't. He may well have been fat when you bought him, but it takes a regular procession of big meals than needed to fatten a snake. 2-3 overfeedings would likely not make them gain 5-10 grams.Well when I bought him the guy at the pet store said he's 2 years old. It's been almost a year since then.
I wasn't ready for the fact that 2 or 3 instance of overfeeding could permanently make a snake this fat.
You can either stretch out time or food size. 1-2 rodents per 1-2 weeks is very vague. I'm sure one mouse every 2 weeks would not have him in that shape, 2 mice every week would in a summer. Try weanlings or big hoppers rather than adult mice for a few weeks. They never truly get "full" and tend to be more active. The two girls I got back fat are both always hungry now, I feel bad for them. I'm thinking of breeding them next year just for the weight loss!I was told to feed him every week... I read that 1-2 rodents every 1-2 weeks was a standard feeding schedule so that's what I went with.
A mouse a month won't hurt the animal, but my inclination would be towards smaller meals, and maybe cut him back to every 2 weeks. A month between meals sounds miserable. But I have male hognose that go 6+ weeks every summer on their own, so maybe it's not as bad as I imagine. But male corns love to eat, and I also wonder if the body doesn't start saving resources from starvation.At this point, he's gonna get an adult mouse per month. I don't really have the time to handle him that much. I just don't understand why my snake got obese so easily. I guess I'll just starve him back into thinness.
How long was he in there for? What was the temperature of the water?