Update! It's been almost two years since I started this thread and I am back to ask for more advice...

My poor corn snake has been dieting this entire time and has lost considerable (?) weight going from almost 1300 grams down to 1053 grams.

I fed a small adult mouse every two weeks for the first year and then switched to a medium adult mouse every two weeks for the second year. I provided as much opportunity for exercise as time allowed and painfully ignored all hungry behaviors...

It is once again time to place my annual Layne Labs order and would I would really like to reward my long suffering snake with a decent meal or two. Is it too soon to bump up to large adult mice? Or maybe alternate large and medium adult mice?

I realize that my snake is still considered "heavy" for it's size (4.3') but it's spinal ridge is becoming fairly prominent which bothers me. I am also concerned that continuing such restrictive rations will end up causing more issues than the obesity itself?

Thanks in advance for any input!!!