Poyambilira ngati galu waulimi, Rat Terrier amatha kusaka makoswe ndi tizilombo toyambitsa matenda pamwamba ndi pansi, komanso kufufuza ndi kugwira nyama zazing'ono. Iye ndi watcheru, wolimba mtima, wokhulupirika, ndi womvera, wodzala ndi mphamvu ndiponso wachangu. Amaphunzira mosavuta, amakhala bwino ndi agalu ena. Nkhanza kapena manyazi sizichitika kawirikawiri kwa mtunduwo.
Rat Terriers ndi agalu ochezeka, amphamvu, komanso agalu okondwa omwe amayesetsa kukhala pakati pa ena, samatopa nawo.
Mwachilengedwe, Rat Terrier ndi anthu komanso omvera. Wokhulupirika kwa mwini wake. Ndimakhala bwino ndi ana omwe mumatha kusewera nawo kale. Amafunika kuyanjana kwabwino, makamaka m'miyezi itatu yoyambirira ya moyo. Popanda kuphunzitsidwa bwino, akhoza kukhala wouma khosi komanso wodziimira payekha. Makhalidwe akuyang'ana amasonyezedwa, malingaliro kwa alendo ndi osakhulupirira.