Backstory; I moved into a neighborhood last august and new that I would need a four legged alarm. My wife and had GSD's our whole life. Not the expensive kind, just good solid dogs. This is our second GSD as a married couple, and #4 between my wife and I. All of them have been great.
I take owning the dog very seriously and she spends at least 2 full week days in the country at my moms where she runs and plays for a solid 8 hours. Otherwise she is outside to do her business in the morning, she gets a marrow bone in the morning when I leave for work that she chews all day, and she is outside/playing inside for my whole lunch hour (usually longer than an hour). After work we either go to the park for an hour and she runs interval sprints with me, I throw her frisbee, or we do obedience stuff outside, or shes out back in the yard and we jog around the neighborhood. At least 1 full hour of hard exercise at night, usually longer.
She is with me all weekend; at the park, trail running, at the in laws (who live in the country) or just playing around in general in the backyard. Shes starts every week very well exercised.
With all that being said, my wife and I are about at the end of our rope. It seems like no matter how much she exercises she still sits by the door and whines to go outside. She is extremely insecure and always has been. Her nature is timid, and she loves people to a fault), but lately shes gotten more and more demanding. The other night when I walked in from work she barked/yipped at me and ran to the door whining, which isnt crazy by itself but she had been on my moms "farm" all day playing. She literally demands at all times to go outside, even when she has been outside all day or we have just gotten back from the park or in-laws. At all times that we are inside and home she is with us. Lately she just whines to go outside and takes no satisfaction in just being with us.
My wife and I tossed around the idea of buying a house with an even bigger back yard but I dont think it would matter. Am I doing something wrong? I am at the max allowable time for her being outside (average of 3 hours per day of good exercise with someone throwing her frisbee/running her). Its getting to the point of being unreasonable. I have never had a dog that is this ridiculous and wont spend 1 second just sitting at my feet or chilling out without begging to go outside, not matter how much exercise she has had.
Any solutions? Shes not a "high-drive" dog. She would never make a good working dog just because of how timid she can be. We love her, but at 1.5 years old I expected her to start to get more mature, not more and more idiotic.