There are so many possibilities, since both fawn and agouti are dominant. If they both carry the recessive a and any other recessives you cold get anything in the black, chocolate, blue, and if they both carry the recessive p you could get any of the pink-eyed non albino varieties like argente, champagne, dove....guesses for grabs. I might be able to do better with more information.
You can't really say "fawn is dominant" or "fawn is recessive" because it's not a singular allele. A fawn mouse involves combinations with at least two alleles but sometimes more (many of the best fawns are also chocolate), so depending on the geneplay at work, it can be inherited in a mixture of ways.
With that said, fawn as such is actually not usually dominant (Ay/* p/p) in the United States, although it is in most other countries. It is usually recessive (recessive yellow/gold/red) but when you do get a dominant fawn it is actually an undermarked brindle (Avy/*), often with recessive yellow as well. The pink eyes can make the black stripes on a brindle very hard to see.
Most likey since you are in the US, you have a fawn colored recessive yellow and not a true fawn.
Most likey you will end up with mostly agouti colored babies.
Of course it all depends on what they each carry. If they carry the same things, you could end up with several colors, black, chocolate, etc.
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