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get up earlier and try to get her some exercises and also exercise at night when you get home. Boredom/confinement for some dogs, especially younger is tough
Try playing the radio for her. Country stations work best. But that is too long for a lab to go alone, especially 5 days a week. Another lab for a companion would probably work. Even a cat can help. They are social creatures, and loneliness is like prison for them.
2 1/2 yrs old. I'm up every morning at 5 am playing fetch /chase/tug of war with her, she runs the fence with the neighbor dogs all day, I get home around 4pm and do the same thing, wife does the same around 5pm when she gets home, weekends are full of activity. Another animal is out of the question.....Anybody use dog walking/sitting services