Your dog is guarding his territory and watching out for friends and intruders. He also is most likely thinking - why the heck am I not being taken for a walk!
There is also a lot more interesting stuff going on outside than inside the house, if yours is anything like mine:)
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Dogs stare out for a lot of reasons. Maybe yours want to
have a walk or play outside for a little while. It could also be that it saw
something or it likes watching outside. Some say that it is guarding its
territory and is looking out for intruders. That may be true.
Because most animals are indignant to everything around them and they are curious about everything as well. They are wanderers and they can smell things that make them curious even though they are not looking directly at something in particular.