What can I use to see through my sliding glass doors without the birds

We have double-paned sliding glass doors looking out onto our deck. Our birdfeeders are positioned so that we can watch the birds form the kitchen and dining room. But if the dog goes up to the door to look out, it scares the birds. Is there anything we can put up so that we can see out, but they cannot see in? And it cannot be reflective to keep the birds from flying into the glass.

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