D-con is a poison only-not a deterrent. Poison inside could result in 1 dead inside somewhere you can't reach. Your best bet interior is traps.
no
No, it does not. Catnip is similar to Valerian, which rats also love. They love Valerian enough to walk into traps baited with Valerian. Catnip has a lesser effect on them, but it definitely does not...
you can rap rats on each other but, they would probably die and a dump or/and kind of smart person would do it ;) -Thanks for you question-
if born together then separated they will be territorial if reunited