Sable and nibbler

Question
sable and nibbler play alot the only thing i dont get is every time nibbler tries to play with sable she hisses at him, but yet they chase each other around is this cause they dont like each other they do sleep together sometimes

Answer
Ferrets play very rough with one another, but usually hissing is a sign to the other ferret that they aren't in the mood to play, which sounds like a long, drawn out hiss. Short hisses with lots of jumping and hopping are happy, playful hisses. You only need to be concerned if, while playing, there are screams, blood being drawn, or pooping.