Sorry, but I suspect the type of glass won't have much to do with how your dog(s) behave at the front door since they have a high sense of smell and hearing. And once the doorbell goes off it's like opening the gates for a race--sight has little to do with it. So that's for the canine issue... Yeah, I was going to say much the same thing. Our dog knows when our cars are approaching. When he hears my husband's truck, he runs to the door to "greet Daddy" -- but he is at the door before the truck pulls into the driveway ... sometimes Daddy fools me and walks around the house to enter through the back door, but he never fools the dog. I'm told he behaves the same way when I approach the house. Yet he doesn't lift a paw when other people drive down the street -- he knows the sound of OUR cars. But woe to the UPS man who dares to walk onto dog's porch to leave a package or the yard guys who enter dog's back yard; the dog does not approve of them, and he makes his displeasure known. The real upshot of this situation: I'm talking about a dog who has been blind since birth. He doesn't look out the windows at all, yet he knows and reacts to people arriving at the house. So my guess is that your dog is going to do what your dog is going to do. The type of glass you choose will not change his behavior.

Anna yes, IF there is a light source inside the house. I have large dining room windows that can be seen through the side light if you place your face right up to it, but if the dining room curtains are shut you cannot see in. At night, the mirror effect reverses so you need something for privacy. My front window doesn't have another window behind it, and people cannot see in even with their face pressed against the glass....if my lights are off. During the day, only a tiny bit of my chandelier shows through the film (when on) , but nothing else of the room shows. I really love this film BUT it doesn't let any sun rays through that house plants need, so don't plan on growing any sun loving plants by these windows.

Perhaps if you posted a picture of the front of your house, and the two doors that are under consideration, you would get some decent responses. Absent that, here's my choice:

Hey There: You can install minimalistic light filtering bottom-up top-down shades to the door. This allows for light coming in the home but still gives you full privacy... This is a great way to manage light and privacy without having to block the light all year round.