Umngane onemilenze emine ngokuvamile ufinyelela ukuphakama ekubuneni kuka-25 kuya ku-45 cm. Ngakho-ke ingenye yezinja ezincane kuya kweziphakathi nendawo. Umngane onemilenze emine ufinyelela isisindo esingamakhilogremu angu-4 kuya kwangu-15. Amasayizi ahlukene inja engafinyelela kuwo ayaziwa nangokuthi ithoyizi (izinja ezincane), i-miniature, kanye ne-standard (abameleli abakhulu kakhulu bohlobo).
#1 Nokho, kuhluke kakhulu kubantu ongabazi. I-Rat Terrier ngokuvamile iyasolisa futhi igodliwe.
Yingakho efaneleka impela njengenja encane egadayo.
#2 Njengenja yokuqala yokuzingela amagundane, kufanele ulindele ukuthi i-Rat Terrier ibe nomzwelo oqinile wokuzingela.
#3 Umngane onemilenze emine ufanelekile ukugcinwa efulethini ledolobha.
Kodwa-ke kuphela uma ethola ukuzivocavoca okwanele emoyeni ohlanzekile - okungcono kakhulu emapaki amakhulu. Uhambo oluvamile lokuya ehlathini kufanele futhi lufakwe.