Dog’s range that is large (7)
I believe the answer is:
spaniel
'dog's' is the definition.
(spaniel is a kind of dog)
'range that is large' is the wordplay.
'range' becomes 'span' (I've seen this before).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'large' becomes 'L' (eg in clothes sizes).
'span'+'ie'+'l'='SPANIEL'
(Other definitions for spaniel that I've seen before include "Breed of dog" , "See 1 Across" , "Dog found among the alpines" , "Dog - leaps in (anag)" , "Animal" .)