I'll be watching this thread with interest. Archie started this at a similar age and to be honest he now chews EVERYTHING that is soft - sofas, cushions pillows, duvets, clothes etc. I now cannot leave him unattended in any room but the kitchen. It doesnt matter if im in or out! However, I have found that deep heat spray is very effective at repelling him from the sofa. Spray it on when Rolo is not near it though, you don't want it to go on him. I also provided Archie with charity shop soft toys. The mess is dreadful but if he must chew, I'd rather it was those. He has a treat ball for when he's left which keeps him pretty occupied too.