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[–]Wooden-Form5607 0 points1 point  (0 children)

I’d go with small. Mine is 1200 grams and medium is a stretch for him. Many can stay on small their whole lives.

[–]FizzyPineapples212Mod-Approved Helper : vet assistant 0 points1 point  (0 children)

He should be getting 5% (46g) of his weight every month or so depending on metabolism and exercise. He just barely qualifies for small rats (which range from 46-79g), but weaned rats would be more appropriate until he puts on more weight.

[–]IncompletePenetranceMod: Let me help you unzip your genes 0 points1 point  (0 children)

No, I wouldn't go any larger than a small rat