Can someone help, our Charlie who is now 6 months old has developed what I am finding a little disturbing. He has decided that the most comfy place to sleep is behind our sofa, thats fine, however when it is time for all of us to turn in and for him to go to his own bed, when we attempt to move him he gives a quite nasty growl and refuses to move, he has'nt snapped out at us as we have tended to coax him out by calling to him from another room when he then comes after a few minutes. I am a little worried at this and need to correct it quickly. please help