I think this is the right way, but I just wanted to verify since every video and article I find seems to show DI or Polymorphism but not both.

Does the following code do both in the most idiomatic Golang way?

package aminolllls

type Pet interface {
    Speak()
}

func (d *Dog) Speak() {
    // bark
}

func (c *Cat) Speak() {
    // meow
}

type Dog struct {
    someOtherInterface
}
type Cat struct {
    someOtherInterface
}

func NewDogType(foo someOtherInterface) Dog{
    return Dog{foo}
}

func NewCatType(foo someOtherInterface) Cat{
    return Cat{foo}
}