Hi, My guy is 11 months now and I've had your problen. He destroyed this lovely crate liner bed, he chewed the sherpa cushion in his brand new LL Bean bed, and I won't get into my couches. I took the breds away from him . He doesn't chew his cotton covered Cabela's bed tho' he likes furrier fabric. It is the most exasperating part the chewing. I use a mesh muzzel when he gets into chewing mode. He gets very submissive . I don't leave it on long but it seems to work . There's got to be some consequence!
Other than that we all love him dearly and he is maturing into a great guy. He chews less than he used to now, thankfully.