Read about the Canadian Eskimo Dog, and see what size dog door it would need.
Canadian Eskimo Dog
The Best Pet Door
Most pets hate flap doors! PlexiDor Pet Doors are long-lasting and beloved alternatives.They have hinges, like a door, so there's no loud flap slap or flexible materials. They lock easily, and most models come with a steel security plate for additional security when you are away.
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