fancy mice and feeder mice are the same, only difference is the typical feeder mouse is the white/red eyed version of fancy mice.

If they are unusually small, they are probably pretty inbred. I suggest breeding them to live white feeder mice to get more size...or find out if all the local pet stores get their mice from the same supplier. If not, buy one sex from one place and the other sex from the other place, to get cleaner genes.

However, it is also possible the mice you have are just young. Males and female mice can breed by 5 weeks of age. Waiting till they are at least 8 weeks before breeding is best..gives them more time to grow.

Just so you are aware, the demand for pet mice isn't very high...you may find it hard to find good homes for the babies consistently, unless you intend to sell them back to the pet store or have a wholesaler (though these often require a health check). I bred fancy mice for fun but most of the offspring I fed to my snakes or sold as feeders.
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PHLdyPayne

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