had to separate my female pair today after thinking I finally had found a friend for my semi aggressive sow she has attacked the poor female friend she had leaving her in a nasty way with a deep cut to her throat, front leg and back hip.. its a shame as they had been fine for 4 months and all of a sudden she wasn't happy and went for her.. ive taken the injured girl(the guinea pig in my photo) inside (shell be seeing a vet later today for medication) so I can keep an eye on her and keep the wound clean.. shes on fleece in a small 3ft cage next to my bed for now.. may just have to keep her inside so she can have lots of human interaction as she is very friendly but I have no one else to pair her with as my others are males.. so guess I'm her friend from now on.