go to the vet and check out if ears and eyes are still ok.
because of:
Quote:
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Over the past 6 months or so he has been barking a lot more then usual
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maybe he becomes deaf or can not see as good as he could (eye cataract).
Has anything changed in your life?
Next time, when he barks, praise him by caressing (clapping) his shoulder for two times, take him out of the situation and give him an alternative, something you would like him to do.
Take him on the leash in special situations in the house and watch if its behaviour changes through it. A leash should give a form of sureness. Maybe he needs this sign to know that the owner is still there and takes the responsibility for the safety within the pack.
LG
gs