Rats are just like all other prey species. They hide all illness until it is just about too late and progressed very far.
If they've been together for a month, then it makes sense that you begin to see the outward signs of illness now.
Just... stop bringing in rats. You cant afford it in lost production or vet bills.
Keep him warm, well ventilated away from drafts. Give him soft food, and away from all the other rats.








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