No, rats are a social pet, and they should be kept in single sex pairs or small groups known as a mischief! Introducing a new rat takes time, and we suggest asking your local pet retailer for their expert advice. Ideally it is easier to introduce a young rat of 6-8 weeks of age. They should not be any younger as they are more likely to become injured should things go wrong, but an adult rat can also be difficult to introduce. Never put a new rat straight into the cage with the others. Make sure you give them time to get used to each other’s smell and site by keeping the new rat in a separate cage in the same room, and gradually bringing these closer together. This can take several days or even weeks.