I adopted a new rat about a month ago and now I've got another one from the same shelter. My first rat seems territorial and I'm nervous about putting them together. Should I do a gradual introduction?
Definitely go gradual with this. I'd keep them separated for at least a couple weeks, maybe longer if your first rat is really territorial - let them get used to each other's scent by swapping bedding between cages and feeding them on opposite sides of a barrier so they associate good stuff with each other's presence. Once they seem calm around that, you can do supervised meetings in neutral territory like a bathtub or a large box where neither has claimed dominance yet. Some rats click right away and some need more time, so don't rush it and watch for signs of actual aggression versus just the usual posturing and squeaking.
Definitely go gradual with it - rats can be pretty territorial at first even though they're social animals. I'd keep them in separate enclosures next to each other for a week or so so they can get used to each other's smell, then do supervised playtime in a neutral space like a bathroom or playpen where neither one feels like it's their territory. Some people swap their bedding between cages too so they get even more familiar with each other's scent. Watch for actual fighting vs just posturing and squeaking - a little rough housing is normal but if there's real aggression you might need more time before trying again.
Gradual introduction is definitely the way to go. Rats are social animals and most do okay together eventually, but forcing them together immediately is asking for trouble. You'll want to spend like a week or two on this depending on how they respond. Start by keeping them in separate cages in the same room so they get used to each other's smell and presence without any risk of fighting. Your territorial rat needs time to adjust to the idea that there's another rat around.
After a few days of that, you can try the "neutral territory" approach where you put both of them in a space neither has claimed yet - like a bathtub or a large empty box. Keep these sessions short, maybe 10-15 minutes, and watch them closely. Some rats will be cool with it pretty quickly, others take longer. You're looking for grooming and playing rather than chasing or aggressive posturing. If things seem tense, separate them and try again in a day or two. Most people find it works better if you do these neutral territory meetings multiple times before attempting a full cage merge.
Once they seem genuinely chill with each other during neutral territory sessions, you can try putting them together in the original cage, but make sure there's enough space and multiple hideouts so neither one feels cornered. Have a backup cage ready just in case, but honestly most rescue rats settle into living together pretty well once you don't rush it. The patience pays off because once they bond, they'll keep each other company and you'll notice they're less stressed overall.
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