You can convert before calling:
    
    
    type
      Animal = ref object of RootObj
      Dog = ref object of Animal
    
    proc cry(x: Animal) {.base.} = echo "Foobar"
    proc cry(x: Dog) = echo "Bark"
    
    let x = Dog()
    
    x.cry
    x.Animal.cry
    
    
    Run

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