the first thing you need to ask before breeding - is where did you get your rats from? If they came from a petshop then breeding from them would not be recommended as you have no back ground on them, health/temperament etc.

If they came from a rescue then there is probably a clause in the contract you signed which says they must not be bred from.

If they came from a breeder, then you do need to have the breeders permission to breed from them as most breeders home with a pet only contract unless pre arranged.

There is a market for dumbo rats and there are a few established breeders that breed them.

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Jacky and the pet gang