my ferret has been working since 4 months old and its 3 years old now and in that time its never slept down a hole or fell asleep on tyhe job of ever let me down and today when i was ferreting a had done 4 massive warrens and on the last warren the ferret came out the hole so i put it on my arm and as a was walking across the warren and just about to put the ferret down the hole i noticed it had fell asleep on the job is that just a sign of old age or what its never done that before has anyone else had there ferret do that on them or what do you think is wrong with the ferret