I'm guessing he has probably always been like this. We got him from a rescue who got him from a shelter. His previous owners got rid of him because he was "too pesty". I do wonder if they didn't give him much attention so he started acting like this trying to get attention. I have no idea if we're doing the right thing or not, but when we catch him stealing something to chew on, we sternly tell him now and put him in his kennel for a little while. I'm not sure if it's helping yet or not.
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