They stink really bad...like literally your entire house is going to smell like ferret. You will have to constantly change out their bedding and litter box, because there will be nasty smelling shit all over (fun). They are sneaky and can contort and hide in small places that you believe they shouldn't be able to fit in. If you have a dog door, they will find their way out of it if you let them roam free. And if you happen to have frogs or toads outside, the ferret will go Hitler super saiyan and dig up the entire frog or toad population, chew their heads off, and store their bodies under your bed unbeknownst to you. Well...maybe the last part was just MY ferret...I dunno.