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Most rats do like the company of another rat.  If it is possible, getting your rattie a littermate (or another rat that your rat lived with before) would make introducing a cagemate easier.  It doesn't have to be a rat its met before, as long as you take care when introducing them.  The following articles should give you some tips on safely introducing rats:
 
Introducing New Rats 
Rat Introductions 
Introducing Rats to New Companions Good luck!  |