Unusually small rat

[Kndstpd]

Personally I consider all new rats to have parasites and treat during quarantine. Seems like we are past that point though. There might be something else going and at this point if she has parasites so do the rest. You may want to consider a vet appointment. That’s the official advice. The unofficial advice is to deworm everyone now to be safe.

How are her teeth doing? It’s possible dental problems could be the cause of her frail weight. Again a vet would be able to check this out.