Having recently told friends that H is much better at not chewing things, hey presto he has just chewed quite a substantial hole in my bed's mattress the little blighter

. I stupidly left the door to my bedroom open while I went off to do my piano practice (he usually lies down quite happily for a snooze in the hall outside) and after 40 mins or so I found him up on the bed, tail wagging with stuffing in his mouth

There is quite a large piece of foam rubber missing ie must be inside him

so I rang my vet to check if should make him sick but been told not to, but if he shows any signs of sickness/distress to give them a buzz.
Has anyone out there had there cocker do something similar ?