Originally Posted by Khay
Have you ever tried introducing another rat to Tia? What did she do? Pin it down and dig into its stomach with her nose while the other rat was screeching like it was being skinned alive? That is what's supposed to happen. It's called power-grooming. No blood, no foul.
Go to any rat forum, and they will say, rats should never be kept alone unless they've proven to completely dislike other rats (That takes months to determine. Some introductions just take longer because they can't figure out their pecking order.) Or if the rat is ill/injured in such a way that they need to be quarantined or alone because other rats would be a danger to them.