Breeding hairless females is not good unless you have a female available to be foster mom.
Your female has a lump on her side, hairless rats are very susceptible to tumors and that looks like one, I wouldn't breed her if that's the case
Double Rex(Homozygous Rex) is similar to any other Homozygous breeding IE: Super pastel X Normal makes all pastels..
Double Rex to standard coat makes 100% rex
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