Rat Terrier oo asal ahaan u dhashay sida ey beeraley ah, wuxuu awood u leeyahay inuu ugaarsado jiirka iyo dulinnada kale ee korka iyo dhulka ka hooseeya, iyo sidoo kale dabagalka iyo soo qabashada xayawaanka yar yar. Waa foojignaan, geesinimo, daacad ah, iyo addeecid, ka buuxda tamar iyo xamaasad. Si sahal ah wax u barta, ula heshiiya eeyaha kale. Gardarada ama xishoodku maaha mid caan u ah taranka.
Rat Terriers waa eeyo saaxiibtinimo, firfircoon, iyo eeyo farxad leh kuwaas oo ku dadaalaya inay noqdaan xudunta dareenka dadka kale, weligood kama caajisaan iyaga.
Dabci ahaan, Rat Terrier waa mid bulsheed oo xasaasi ah. Daacad u ah milkiilaheeda. Si fiican ula dhaqan carruurta aad hore ula ciyaari karto. Wuxuu u baahan yahay is-dhexgal wanaagsan, gaar ahaan saddexda bilood ee ugu horreeya nolosha. Haddii uusan jirin tababar ku habboon, wuxuu noqon karaa madax adag oo madax-bannaan. Sifooyin fiirsasho leh ayaa lagu muujiyaa, dabeecadda ku wajahan shisheeyaha waa kalsooni darro.