>>I've never seen a rat or mouse do this as a symptom of impending birth. However, I have seen it, several times. I suspect that it is the result of a severe ear infection or something of the type. Causes the effected rat to keep their head cocked to one side all the time for no apparent reason. I've left them be in this condition before, and sometime's they get better, but when they get to the point of running in circles I figure their must be a considerable amount of pain associated so I usually go ahead and put them down.
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>>Let her have the pups. Try to wean them onto another doe for nursing. Then put her out of her misery (Unless of course someone knows how to cure her, I'd like to know about that too, I've had to put down a few real favorites)
I am with this advice. As to cure....only if you want to put the money into a vet visit at least once to get meds and a correct dosage to treat her and any others.(though rarely do I see it as contagious) Some pet people will do this but usually feeder breeders don't find it worthwhile. Once she has the head tilt, even if the ear infection is treated the tilt is just as likely permanent. A second possible cause of tilt is tumors. Either way she is not likely to return to any good level of productivity.
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Sonya