If his weight and body condition are good then I wouldn’t worry. Also medium rats are bigger than most males will ever need to eat. Smalls should suffice for their entire adult life. My 9yr old male, Geoffrey, regularly goes off food as early as October and will fast till as late as May. I did have him eating mediums for a short bit a few years back and that’s when his feeding was the most sporadic and his longest fast (oct-June).
Offer a small in a couple weeks, if he refuses then try again three weeks later. Eventually he’ll eat.
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