Grocery store foods are NOT acceptable. Ferrets can not digest fiber, so limit fiber rich foods and treats. Some people will say, hey ferrets can live off of anything. A good diet is very important to both people and animals. Ferrets are best trained by rewards, never by punishment.
Ferrets are by nature very curious animals.
They like to get into small spaces and rooms and investigate. The problem is when these areas are dangerous to the ferrets. Appliances such as refrigerators, stoves, washing machines, and similar items can be dangerous if the ferret manages to get inside. Couches and recliners can be death traps for ferrets. A ferret can get crushed in the gears of a recliner or in the springs of a couch by an unsuspecting owner who thinks the ferret is not even in the room.