Reverse Foriegnkey filtering

I've found a need to do this and I'm struggling. Some info seems to indicate that django doesn't support this. How is it meant to be done?

Basically to be clear, I need to filter one queryset on a reverse foriegnkey relation to another set of objects defined by a particualr filter.

model1(Models.model):

    stuff = charfield

model2(Models.model):

    cow = Foreignkey(model1)

    country = charfield

Problem: filter set of model1's by a particular country that's related to model1 through model2

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