Abokin ƙafa huɗu yakan kai tsayi a bushewar 25 zuwa 45 cm. Don haka yana ɗaya daga cikin ƙananan nau'in karnuka masu girma zuwa matsakaici. Abokin mai ƙafafu huɗu ya kai nauyin kilo 4 zuwa 15. Daban-daban masu girma dabam da kare zai iya kaiwa ana kuma san su azaman abin wasa (kananan karnuka), ƙanana, da daidaitattun (mafi girma wakilan nau'in).
#1 Duk da haka, ya bambanta da baƙi. Rat Terrier yawanci yana da shakku kuma yana kiyayewa.
Shi ya sa ya dace sosai a matsayin ƙaramin kare mai gadi.
#2 A matsayin karen farautar bera na asali, yakamata ku yi tsammanin Rat Terrier ya sami ƙwaƙƙwaran ilhami na farauta.
#3 Abokin ƙafa huɗu ya dace da kasancewa a cikin ɗakin gida.
Amma ba shakka kawai idan ya sami isasshen motsa jiki a cikin iska mai kyau - zai fi dacewa a manyan wuraren shakatawa. Hakanan ya kamata a haɗa tafiye-tafiye na yau da kullun zuwa daji.